For $1300, this is the best build you can get:
CPU- AMD64 X2 3800- $322
Mobo- eVGA sli mobo (free with purchase of 7800GT from MonarchComputer)
Ram- OCZ Performance 2GB (1GBx2)- $200
DVD Burner- 2x NEC Dual Layer- $100
Video Card- eVGA 7800GT- $360 (from Monarch Computer)
Sound Card- Creative X-Fi XtremeMusic- $112
Case- Your choice- $50
Power Supply- Antec TRUEPOWERII TPII-550- $90
Operating System- Windows XP Pro Upgrade- $80
Total- $1314