I'm going to build a gaming rig for my brother. He mostly plays Left 4 Dead 2, but I'd like to get him a good enough card to run other games if he wants.

A friend gave me an 8800GT card, an 80 GB hard drive, and I have a HP Pavilion p6500t case my current parts came in.

If I buy a friend's PNY 250 card, then I will put my BFG 9800GT in my bro's computer.

I don't know what kind of motherboard, cpu cooling, and processor to get. He'll probably just need a dual core processor.

I'll have to find out. I know AMD processors are cheaper than Intel. Some people say Intel is better while others say Intel and AMD are the same at performance. Any suggestions on the parts I need?