Id get a better case such as the Antec Illusionhttp://www.newegg.com/Product/Product.aspx?Item=N82E16811129066
If ya gettin WD, you want the Black not the Blue ... Seagate 7200.12 or Spinpoint F3 also works.
I'd get the 900 Mhz version, starts at $215http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&DEPA=0&Order=BESTMATCH&Description=560+GTX+900MHz&x=0&y=0
gtx 560 frozr II vs 6950 non frozr....
The factory OC'd 560 Ti's perform very close to the 570's. Guru3D uses the following games in their test suite, COD-MW, Bad Company 2, Dirt 2, Far Cry 2, Metro 2033, Dawn of Discovery, Crysis Warhead. Total fps (summing fps in each game) for the various options (single card / SL or CF) are tabulated below6950 (479/751)
560 Ti (455/792)
6970 (526/825)560 Ti - 900 Mhz (495/862)
Of course, with a different game suite, your mileage may vary.