Main: AMD dual core 3.0ghz (Athlon 64 x2 6000+)
Parent's PC: AMD Athlon 1.67ghz, forget the specifics (bit better than the Mediabox)
Mediabox: AMD Sempron 1.67ghz 233fsb (that FSB makes it act like a snail though, so it's doing little more than serving files to my network beside my TV)
Reverse the order of those pc's and you've got the order I built them in, been getting smarter as to what parts actually work fairly well together (Rule #1: Don't neglect the motherboard, and don't cheap out)