Search the forums, many threads on this topic.
P4 generally considered slightly better for video editing, but Athlon64 no slouch either, and will play games better and cooler. I chose Athlon 3400 Newcastle + DFI Lanparty UT nf3 250gb + 1-2GB RAM, RAID 0 for scratch disk.
Look around the forums.
<i>...just ignore me, I'm still just a stranger!</i>