I say give me a highly expandable platform.
Lots of slots for add on cards. I'll choose what I want, either a graphics powerhouse or RAID server.
As for CPU, whatever. all are quite well done these days. I like the Cell idea, but most important to me is expandability. I may not want what the guy next door has. Keeps the cost down not having to add all that extra stuff in, and they can sell me additional cards to do the things I want like TV, Firewire, Graphics, RAId etc etc.