xeon is the SMP p4.. same thing, just more expensive
anyways, yeah i was going to probably do like a 550 or 650w psu to make sure, and i'm thinking about even watercooling this rig. i figrue, why the hell not, might cut down a little on the noise factor.
i dunno about any 64bit video editing card... i just use regular capture cards or firewire. mostly firewire. then again, i'm usually just editing someone else's clips at the moment, what little i'm doing. but it takes a lot of time to convert stuff, and compress and such.
plus, photoshop is multithreading