Can't really post links right now (on iPod) but go to pccasegear.com and look for something along these lines
I5 2500k (upgrade to the ivy bridge CPUs next year)
Gigabyte z68 motherboard
An ASUS, msi, or evga gtx 580 (2 of them)
A corsair, xfx, antec, seasonic, silverstone, or pc power and cooling 850w pay preferably modular
8gbs of ddr3 1600 MHz
A 120gb ssd (make sure is sata iii)
Then western digital 1 tb caviar black (2 in raid 0 if you want the space)
A cooler master haf series case or corsair anything
A corsair or antic liquid cooling system
Lastly a copy of windows 7 oem 64 bit or the retail version so it can be moved to a different mobo later
Then all the peripherals and other things (DVD drive, keyboard, mouse, etc) and you should be a bit under budget I think