Some AM2/AM3 mobo ~ 60$.
Phenom II x3 720 ~120$
4GB Dual-Channel (2x2GB) Either DDR3 1333 or DDR2 1066 (D3-50$, D2-40$)
500GB HDD (Western Digital has good warranty, I think) - 55$
9800GT is fine, don't worry about it.
this is what i am going to go with
AMD PHENOM II 720X3 CORES BLACK EDITION/2.8GHZ/7.5MB CACHE/AM3 SOCKET
MOTHERBOARD GIGABYTE GA MA790X DS4/AM2+ AM3 READY/DUAL PCI-EXPRESS SLOTS
MEMORY 4GB OF DDR2 OCZ REAPER PC2 8500/1066MHZ
now how is this for gameing i hope the cpu is fast enough
also would xp be better to use then vista and if i use xp i am going to use an ide hard drive because i don't want to go through hell trying to get xp to install over sata, now will useing an ide hd be that much slower then sata will be cause any probloms gameing