Recent XP 2500s don't usually overclock as well as some of the earlier issues of the chip. If you're counting on running one at 200MHz front side bus you might just be in for a bit of disappointment!
On the other hand, when looking at Athlon64 I think RAM compatibility is the wrong thing to be worried about - you should be concerned about the Socket format! A64s will be moving to the Socket939 format sometime in the near future, and those jumping in to the current Socket format might just be left with a rather limited upgrade path.
For the moment, I'd suggest an XP in the 3000+ or 3200+ models, or a P4 at about the 3 GHz range would be ample.
For Video editing, the most important thing to look at in your purchase is decent RAM (which you can reuse later) in copious amounts, and heaps of drive storage space, preferably SATA drives for future proofing.
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Grandad
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since Mar 2004