Have you tried accepting? QGA rules!
best way to play against queens gambit.

It depends on your style of play. I used to play Tchigorin Defense but moved on to the King's Indian Defense.

The Tchigorin is tough to master though. You're getting ready for an e5 strike, which is good, but the knight doesn't feel right on c6 to me. I'm a Bogo/Nimzo-Indian player but for 1...d5 I wouldn't say there's a best, though 2...e6 2...c6 and yes 2...Nc6 are good choices. 2...dxc4 is good as well, using the d5 square for a pivot and making the d4 pawn an object of attack. Don't try holding onto the pawn though.

The Chigorin (2. ... Nc6) is much better than its reputation. You have to be careful, though... here, a 1963-rated player was dead lost against me after only eight moves:
Play the Queen's Gambit Accepted! I would play it if only I wasn't determined to play 1... e6 (or very occasionally 1... Nf6) to pretty much any first move White throws at me :P

The chigorin really isn't all that good. Both the 3. Nc3 lines and the 3. Nf3 Bg4 cxd5 lines are dangerous for black without that much counterplay.

Chigorin is fine, but you have to know precisely what to do. In some lines you're giving up the Bishop pair and the center for rapid development. In other lines, you're giving up the right to castle but it's okay.
QGD/Tarrasch Defense are both great
My recommendation - learn how to play the Semi-Slav.

QGD/Tarrasch Defense are both great
Except for a few really odd lines like 1. e4 f5, most openings lead eventually to near-equal positions.
I've been seriously considering taking up 1. a3 as White.

Chances are you have problems with slow positional chess - I have the same problem. I am trying to get into the theory and aim for a Cambridge-Springs Defense (it's trappy yet positionally sound) and study the White plans and Black's counterideas in the Exchange Variation in order to improve my positional game. Since White can get into the Exchange-Variation at many points, you should be familiar with the Minority Attack and the major ideas in White's setup.
In this position, White has at least 4 main strategic plans that Black should be aware of:
1. Nf3 followed by 0-0 and continue with the Minority Attack (Rab1 and then b4, b5)
2. Nge2, followed by 0-0, f3 and eventually e4. This is one of the most aggressive plans for White.
3. Nf3, 0-0-0 followed by a Kingside pawn storm
4. Nge2, 0-0-0 and pawnstorm on the Kingside
Fortunately, the Exchange Variation isn't as dry as other Exchange lines, here is a supreme example of the madness that can come by:
I saw this game in an opening book years ago and also saw it on Andrew Martins great DVD on the QGD.
So, have fun ;)
I play against queens gambit alot with not much success. What do I do?