This is as cheap as I can get it with your requirements. I did opt for 2GB RAM. If you want to save, you could get 1GB for now, but I don't recommend it.
Possible savings:
RAM: 1GB - G.SKILL 1GB 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) $114.99 (single stick for now, easy to add in the future). Saves $130.00, but I don't recommend it. Get 2GB if you want good performance from a rig like this.
- MoBo: GIGABYTE GA-965P-S3 Socket T (LGA 775) Intel P965 Express $115.99
- CPU: Intel Core 2 Duo E6300 Conroe 1.86GHz $181.49
- RAM: BUFFALO Firestix 2GB (2 x 1GB) DDR2 800 (PC2 6400) $244.99
- Video: eVGA 640-P2-N821-AR GeForce 8800GTS 640MB GDDR3 $449.99
- HDD: Western Digital Caviar RE WD1600YS 160GB 16 MB Cache $64.99
- DVD: LITE-ON 18X DVD±R Burner Black $29.99
- CPU Cooler: Thermaltake Big Typhoon $43.99
- Case: COOLER MASTER Centurion 5 CAC-T05-UW Black Aluminum Bezel $44.99
- PSU: SILVERSTONE SST-ST50EF ATX12V 500W $87.50
Possible savings:
RAM: 1GB - G.SKILL 1GB 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) $114.99 (single stick for now, easy to add in the future). Saves $130.00, but I don't recommend it. Get 2GB if you want good performance from a rig like this.