The Queen's Gambit has been my bread and butter for a while now as white, and while I still love the opening, I was wondering if there are any good alternatives I could check out for white after 1. d4 d5? Preferably something similar the the Queen's Gambit (closed/positional) to fit my playing style?

2 c3 is interesting......with a view playing a Stonewall with the queen bishop outside the pawn chain eg 1d4 d5 2c3 Nf6 3 Bg5  or 1d4 d5 2c3 e6 3Nd2 followed at some stage by Bg5 and f4....

White is playing as "black" with useful type of waiting move....not as good as 2c4 of course but a little surprising. I recently got a better postion against a higher rated player in a rapid play game recently before losing it :-)

How about the Catalan? :P (1.d4 d4 2. c4 e6 3.Nf3 Nf6 4.g3) It is a very positional opening in nature but its not fully "closed" (4...dxc4 is the Open Catalan)

I've never played the Catalan, but I know it's a solid opening, solid enough to beat Topalov, at least ;) I'll definitely try it out, but I was also hoping for an opening to avoid 2. c4 as white, as the Catalan seems to depend a bit on black's moves.

I've had some fun with the Torre Attack on occasion.

I've been meaning to try that, along with the colle system. I used to love playing the stonewall attack, but I've heard it's not sound.

There are a lot of similarities. I like the Torre a little better because it gets the queen bishop active outside the pawns. A logical but lackadaisical defense by black can give white the opportunity for some quick attacks. It can also be a surprise alternative to some QG defenses while still leaving open transpositional possibilities early (if you choose to play c4 later than move 2).

It's going to be very difficult to find something "similar" to the QG after 1 d4 d5, but without playing c4 at some point.