Thank you for the help. Also I was wondering how big of a power supply I would need. He wants me to keep the cost of this PC relatively low, so the rest of the parts would be average. Here are the specs I have picked out so far:
Sapphire Radeon HD 4670 PCI-e
M-Audio Delta 1919 LT PCI
Kingston HyperX 4GB (4x1GB)
Western Digital 500GB SATA
Gigabyte GA-EP45-UD3R LGA 775
Intel Dual Core E2200
LG 22X DVD Burner