Originally Posted by NrGx

If it's a business, you dont want to overclock. You want stability. As stated by Shajbot, go AMD all the way. JUst choose some reasonably cheap dual cores like the 4000+ or even the 3800+.

For graphics cards, get the 8800GTS 320MB. You want to have dx10 capability on these computers put tbh, you don't want to put obscene amounts of money into the graphics.

Cases can be very generic, it doesn't matter.

Motherboard needs to be cheap and stable. Screw BIOS options.

You should also consider putting some cans on each one.

Basically, the idea is, make a computer that is good enough for what its purpose is, without customizability. You need stability if these computers are going to be on 24/7.