Personally, I've always liked the Open Sicilian. It leads to a wide variety of fun and interesting games (from both sides). The down side to it is Black has a ton of options (Dragon, Accelerated Dragon, Hyper-Accelerated Dragon, Najdorf, Taimanov, 4 Knights, Kan, Sveshnikov, Classical, etc) and each is a bit different.
There are some other options if you want to avoid getting into all those lines. The best of those are the following: Closed Sicilian, Grand Prix, Alapin, Smith-Morra Gambit.
The Closed Sicilian was a favorite of Spassky. It avoids a lot of theory and leads to a more strategic game. The problem is that the Botvinnik Setup from the Black side can cause some problems (but you are not likely to run into that much at the sub-1500 levels).
The Alapin is a favorite of a lot of people who want a simple system to play against the Sicilian. In fact, I know a couple NMs who swear by it. There are 2 key issues with this choice (in my opinion): 1) In many lines it leaves White with an IQP where the plans for Black are very simple, and 2) If Black doesn't walk into the main attacking idea (the queen-bishop battery on h7), he equalizes quickly
The Grand Prix Attack is a nice way to rack up some quick wins. My coach's son (~2350 FM) used it exclusively until he was about 2000 FIDE (and started running into people who knew how to handle it). The main problem is it is a bit of a one-trick-pony; once the attack is concluded (either by checkmating your opponent if he doesn't handle it well, or by dissolving if he does) there isn't any real follow-up plan.
Finally, the Smith-Morra Gambit. I know several coaches who recommend this for their lower level players to get used to playing with the initiative. The development scheme is simple enough, and there are attacking options on both sides of the board in many lines. The two major problems with this choice: 1) If Black declines it, you are likely to transpose into an Alapin. If you aren't familiar with the plans there, you may be in trouble quickly. 2) There are lines where White does not get a lead in development to compensate for the pawn leaving him with a worse position in the middlegame.
Whatever you choose to play, I would look up some games played in that line by some strong players and see how they handled it (not memorizing their moves, but seeing how they developed their pieces, what pawn breaks they choose, what plans they executed in the middlegame, what types of endgames did they tend to reach, etc).
Thank you all for all of the comments and advice. I appreciate all of it