Depending on how soon you're looking to move, I'll be selling my Pentium 4 3.0 with 1 gig of dual channel DDR 3200 (Corsair CL2) and Intel 865 board. It'd probably be $200 plus shipping for the whole deal.
Anyways, new, I'd probably go Athlon 64 3800+ AM2 ($115), an ASUS AM2 board ($75), and a...