K lets ee here
AMD X2 3800+ $300
eVGA 7900GT $300, i highly doubt you need a 7900 GTX, the 7900 GT is still the amazing
DFI Lanparty UT Ultra-D $120
Corsair XMS 2x1GB dual channel $160
That Aspire Case suggested before $65
NEC 3550A Drive $30
Caviar 80GB SATA $50
comes to a total of $1025, but i didnt calculate any rebates so...it should be below 1000