Hello, my current GPU is the EVGA 275 gtx and it has worked great up to this point but I am looking to upgrade my card to get some better performance. I will spend up to about $300 for a new card at this time. My setup looks like this:
Intel Core i7 920
EVGA 275 gtx
Asus P6t mobo
antec 1000w Truepower Quattro PSU
6 gig corsair 1333 ram
antec 900 case
The best cards for that price would be a GTX 470 or the higher end ATI 5000s. You could easily run 3-way SLI with GTX 470s/480s, so if you intend to shell out that money over time, you can support something like that.