I would go for a AM2 or Conroe CPU with DDR2 High frequency/ Low latencie RAM on a ASUS mobo then maybe a 7900 GT/GTX 
You should aim for 2gb of RAM and probably a SATA 2 HDD
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ASUS A8N SLi Deluxe
Corsair 2GB DDR XMS3200XL Pro TwinX (4x512MB)
AMD Athlon 64 X2 939 4600+ @ 2.6 Ghz
ATi Radeon HD 3850 @ 680/844
80GB SATA HDD/200GB PATA HDD
1x DVDRW DL
485W PSU, Alpha watercooling
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