With what you want in it, pretty tough getting it to $1000 with OS before rebates. Especially by getting any decent graphics in it.
I would say you can get what you want for about $1000 without the graphics card. And then add the card with however much juice you want.
You have an expandable Asus Z68 MB, overclockable CPU, a case you wanted, enough juice on the PSU to handle SLI/Crossfire and OC.
CPU+mobo combo: i5 2500k + Asus P8Z68-V Pro
HSF: Noctual NH-D14
Mem: Gskill ripjawsX 2x4GB 1.5V CAS9 1600Mhz
Case: Antec DF-85
$154.99 ( before $20 MIR )
PSU: Antec CP-850 850W
$114.99 ( before $25 MIR )
HDD: Samsung Spinpoint F3 1TB
DVD: Asus 24x DVD burner
OS: Windows 7 Home Premium 64-bit
Then add a graphics card: 6950, 560Ti ~ $200-$220 after rebates ( $250 before )
6870, 560 ~$160 after rebates ( $180 before )
You end up with something in the $1200-$1250 range and it should play nicely in resolutions between 1680x1050 - 1920x1080.