A test between Xeon and MPs (about a month ago) mainly showed Xeon on top, but MPs weren't that far behind.
I'd just go with MPs because I could game on it until they were obsolete, and then turn it into a server.
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--Soyo KT333 DRAGON Ultra (Platinum Edition)
--AMD 1.4 @ 1.54 (11x)
--768mb of PC2100 (@140FSB)
--Asus v8200 GeForce3 @ 210/490
--Maxtor 40gb Quiet + 2 IBM 40gb 60GXPs (removable) + 8gb WD
--Audigy
--Maze 3, DD Gf3 block, 2x BIX, Eheim1250
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