Recommendation for White against 1...e5?

Anyone want to recommend me something to play as White against 1.e4 e5? Ideally it would be something agressive, but idk I can't seem to find lines that are interesting and give White attacking prospects, but don't hand Black equality. I don't mind theory btw. All suggestions welcome :)

I find it interesting how you care about not giving equality. I play many equal opening lines, I find no issue with such really. Just outplaying your opponent in a middlegame is more enjoyable than relying on a tiny advantage claimed by theory.

And even if you manage to get an opening advantage via theory, you are likely to lose it within 5 moves or less because we are patzers. You should focus on the game itself, rather than pre-game generated chess.

The ponziani is a good example of an opening where there's no objective advantage, but very interesting play one can work with.

Having an opening edge puts less pressure on you and probably makes you less likely to fall into tactics and more likely to follow your plan instead of reacting to his.

As white I try to get an opening advantage, but if I merely get equality I'll settle for that too. When you're prepped you have a chance for an advantage, but worst case scenario you are in an equal position where you know what to do, why, and suffer no confusion, meanwhile your opponent had to waste time and energy just to get there. On the flip side if you fall into a line you are unfamiliar with, this is all turned around in favor of your opponent. I know the feeling of having 5 different moves in a position and being overwhelmed by all of the possibilities -- if you know the line, you will already know the pros and cons of each plan and the position seems much less "scary" if you will. My only two losses to much lower rated players in the last year or two was because of my lack of familiarity in the lines played -- I came under sudden attacks after playing just a few natural but imprecise moves.

I think this stuff can be especially useful for class A players and above. Yes, anyone is still weak enough to possibly give away the advantage, but they will also be able to pose problems for the opponent somewhat more easily -- it's much nicer to start out with an initiative, e.g. pressure on a weak pawn, than to stubbornly try to grab one in a drawish position (you'll probably have to make some risky decisions).

I would try some aggressive ideas like this after 1. e4 e5:

2. c4 (controls the light squares and can transpose into an English opening.)

2. d4 (idea is to break down the black's center.)

2.d3 (strengthens the e4 pawn and can lead to a kingside attack pawn formation.)

2. Nc3 (brings a piece into the action and controls centeral space in the center.)

Those are my suggestions. Personally, I like c4 the best because it allows a fight for both sides to control the critical d4 and d5 squares.

If I played 1.e4 with any amount of consistency I would play the Spanish.
It gives you an advantage, and could be very fun exploring the plethora of rich lines.

Aggressive, and with attacking prospects?  Look no further than the King's Gambit (2. f4).  Just do a little research before you start using it in rated games.    It's a good thing you don't mind theory--it can be your best friend in some lines of the KGA. 

Well, with simply 2.Nf3 you can be agressive.

Most moves other than 2...Nc6 and Nf6 give white an easy advantage.

After 2...Nc6, then play 3.Bc4. Against 3...Bc5, you can play the Evans Gambit, which is sure to beat an unprepared opponent, with 4.b4. Against 3...Nf6, you can play 4.d4! for the agressive Max Lange Attack.

After 2...Nf6, well, it's the Petroff, which is well known to be equalizing, but you can play for advantage with 3.Nxe5 Nxe4 4.Nc3 Nxc3 5.dxc3, and maybe you can attack on the kingside after 0-0-0 and Bd3.

Nf3

I would go for the Four Knights, then the Bb4 or Spanish variation.

Perhaps equality wasn't the word I was looking for...something like "doesn't give Black a comfortable position" I've seen the Giouco Piano recommended a lot against 1.e4 e5, but I don't like it so much, because for example in the Two Knights with 4.d3 and an eventual ...d6, Black has the simple plan of playing ...c5, ...Be6, ...Qc7, ...Rd8, etc. and organizing ...d5, after which Black has a comfortable (and equal) game. I don't really mind theoretical equal so much, just not one that's comfortable for Black. I haven't looked into the Ponziani much, but from what I've seen on the forums, it looks somewhat interesting, and I may check it out further. 

Side Note : I think the main reason why I'm having problems finding lines I like against 1.e4 e5 is that I've played 1...e5 with Black for a little while now, and so I'm always feeling more comfortable with Black in different Ope n Games. 

I'm considering the Scotch...ideally my choice against 1.e4 e5 wouldn't be a gambit. Idk why really, it's just that can't gambits like the Evans be killed off into dry positions if Black gives back his material at whatever point? Idk that's the impression I've gotten from 1...e5 sources I've used playing Black.

The thing is, players 1900+ are likely to be well prepared, and that's the rating category I play most of my tournaments in nowdays.

2. d4 is great and leads to many rich options for both sides. 2. Nc3 is not often played and not bad at all. 2. Nf3 is probably best but maybe what you're opponent is most prepaired for. I like 2. f4 and not just for the cheapos. I would have qualms about the other suggestion here of 2. c4 as I think a prepaired opponent can clamp down on your d4 square having not commited to his/her own d5 weakness yet. It won't always transpose to the English and its statistics are very bad. I believe Black actually wins more games than White after 2... Bc5 (though most people play c6 and there White scores well... also something as rarely played as 2. c4 may have misleading statistics just because it doesn't get assayed often enough for players to figure it out. There may be something to it after all.) It can be a good surprise weapon, though, if you don't think your opponent has seen it before. It will anyone out of the book and thinking on their own on about move 2 and that can be to your advantage especially in a rapid game if you have prepaired the opening. (I don't know anything about 2. d3.)

f4

Well, Black has to play flawlessly in order to dodge White's initiative and equalize.

Playing flawlessly in the opening is surprisingly easy when booked up with loads of theory 

I used to try to get into the Belgrade Gambit from a Vienna Game move order.  That seemed to set my opponents thinking more than you'd expect that early in a game.

I was considering suggesting the Scotch, but I thought the KG would be more aggressive.  The Scotch is also strong (and much safer than the KG).

There also is a Scotch Gambit.  I know you said you didn't want a gambit, but White usually gets the pawn back anyway.  For example, Game Explorer's most popular line is:

IMO White gets a small but safe advantage out of the opening, but it's up to him to play accurately from there.

Yep, yep. The Scotch Gambit has been and is high on my candidates list.