Need a new GPU!

Hey guys, lately I have been having some system problems (going to blue screen on startup) and from all my tests it is the graphics card because memtest found no problems after a night of running and I ran some cpu stability tests and they checked out, but my graphics card has dropped FPS since I tested it last on 3dMark.

My current system is
(going to upgrade mobo and cpu and maybe add more ram around Christmas)

E6400
Msi P965 Platinum Mobo
XFX 7600Gt
2 Gigs of Crosair DDR2-800 XMS2 ram
600watt Thermaltake ToughPower
Monitor- BenQ FP241VW (24 inch 1920x1200 resolution)
and a Raidmax Smilodon case

I want to upgrade to DX10 but I am not sure what card I should get, I need something that can run my resolution for games and I'd like to play Crysis on Dx10 (and the next 2 Crysis's) but the only card that I see promising for my resolution is the 9800Gx2. I am not sure If I can spend 600 bucks on a card however and I am also not sure if my 600watt psu can run it (it should it has 8 and 6 pin connectors and the gx2 says 580watts min for the cheaper PNY card)

Are there any other cards you would suggest? Also I was going to get a PNY if I bought the GX2 but I am in love with EVGA just the extra money is kinda ehhhh for me. I had the idea of maybe buying this EVGA
http://www.newegg.com/Product/Prod [...] 6814130072
and then wait a few months to see how the card prices play out then use the step-up program to go to a 9 series (or not)

please comment
Thanks

Doesn't the step-up program only last 3 months though? So it would be around July if I buy the graphics card in April
Also on Evga's site they have a 1 gb ram GT, would that be better because isn't it the ram that is better for higher resolutions?
http://www.newegg.com/Product/Prod [...] 6814130336

edit: from the info I've found it doesn't add really any difference so you are probably right just get the gts