You can take a look at some more benchmarks and see if you can pick out one that matchs both performance and price goals.
Hard to not take the HD 6970 seriously when you look around and get ready to make a choice.
Wasn't gonna jump in here, thot the best answer post had a pretty good selection of components .... However the build in the Best Answer can't be built, unless Corsair's redesign of ther cases went outside my notice. The CP-850 PSU is CPX form factor and only fits 4 cases, all made by Antec (DF-85, P182, P193, 1200)
While you're at it, tho I have oft recommended the same items many times myself, I'd consider some alternatives......
GFX Card - 6970 and 570 are well matched as single cards but since considering SLI, the 570 in SLI substantially outperforms the 6970 in Xfire (873 total fps versus 6970's 825 according to Guru3D @ 1920 x 1200)
MoBo - P6X58D Premium is a venerable MoBo, I have done many builds with it .... but it's a bit "long in the tooth" so to speak. Unless you're thinking tri-SLI (would never suggest tri-Xfire), I'd get the Sabertooth or P6X58D-E and save a considerable mount of dough.
Put this in the vein of "personal preference" but I always referred to Gskill as "CheapSkill" ..... was a day when I put them in a lot of builds because they were cheaper than the "big boys". Now that the same big boys are matching and most often beating GSkills prices, and my return rate on GSkill modules has been higher than the others, I stopped going that way sometime after a final bad experience last XMas. My return rate on Muskins for example is 1 bad module out of about 200, GSkill I have had to return probably 4 times outta 12 builds, 2 of these being compatibility with existing sets with exact same timings.
I'd grab these for (THG recommended modules) $169 and save the $50