This has happened many times before and I always give the same answer.
CPU- Intel Core 2 Extreme X6800, 1149.99
MOBO-ASUS P5W DH DELUXE, 269.99
RAM-CORSAIR XMS2 2GB (2 x 1GB) 240-Pin DDR2 SDRAM*2, 938.00
GRAPHICS-SAPPHIRE 100150SR Radeon X1900XTX*2, 779.98
SOUND CARD-Creative Sound Blaster X-Fi Elite, 375.00
HD1-Seagate Cheetah 147GB 15,000 RPM*3, 3300.00
HD2-Seagate Barracuda 750GB 7200 RPM*2, 799.98
OPTIACL-Plextor IDE Slot Load 16X DVD±R DVD Burner*2, 293.98
PSU-PC Power & Cooling Turbo-Cool 1KW, 509.99
PHYSX-BFG Tech PhysX Processing, 264.99
TV TUNER-POWERCOLOR Express x1 TV tuner, 73.99
CASE-GIGABYTE GZ-XX1CA-SNB Black, 89.99
SPEAKERS- Creative GigaWorks 700 Watts 7.1, 429.99
SCREEN-Apple 30 in. screen, 1999.00
KEYBOARD-Logitech G15, 68.99
MOUSE-Logitech G7, 71.99
COOLING
CPU-Swiftech APOGEE, 49.99
GRAPHICS-Danger Den Tyee, 249.99
CHIPSET-Danger Den MAZE4, 38.99
HARD DRIVE-Koolance HD-55-L06, 59.99
RAM-Koolance RAM-30-V06, 49.99
RADIATOR-Koolance EHX-1050BK, 224.99
PUMP-Eheim 1048, 56.99
Wich brings it to a grang total of, 12146.78
To bring it to 15000 all you'd need to do is add a few more hard drives.
I wouldn't do it now though, I would ait for dx10 cards and, if you can, quadfather or kentsfeild.