Garethman!!`

I have a few other computers for sale also

Pentium Dual-Core E2160 - 2GB RAM - 250GB HDD - 7300LE - XP Home or Vista Basic
$479.99

Intel Core 2 Quad Q6600 - 2GB RAM - 250GB HDD - 7300LE - No Operating System
$599.99

Intel Core 2 Quad Q6600 - 4GB RAM - 750GB HDD - 8800GTS G92 - XP Home or Vista Basic
$1,299.99

How are the prices on these, and any recommendations?

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CPU: Intel Core 2 Quad Q9450 / AMD Athlon 64 X2 TK-53 1.70GHz
RAM : 8GB DDR2 PC6400 / 2GB DDR2-667 PC5300 A-DATA
HDD : 750GB SATA Seagate Barracuda/ Western Digital Scorpio 250GB 7200RPM
GPU : Radeon HD2900XT 512MB / Radeon Xpress 1150 128MB
OS : Windows Vista Ultimate x64 / Windows Vista Home Premium