I would like the following:

ASUS A8N-E Motherboard ATX S939 NFORCE4 Ultra DDR PCI-E16 PCI-E4 2PCI-E1 3PCI SATA RAID Sound GBLAN $119.60
http://search.ncix.com/displayproduc...nufacture=ASUS

AMD Athlon 64 X2 3800+ Dual Core Processor S939 Manchester 2Ghz 512KBX2 90NM Retail Box $388.26
http://search.ncix.com/displayproduc...anufacture=AMD

Total Cost: $457.86

(Coincidentally, exact the same list as Ryan's... I guess great minds think alike )