Asus / AMD quad-core 2.3GHz barebones PC for $400 + free shipping
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great deal, i would suggest upgrading at least the PSU
I would upgrade the PSU and the CPU.
With that money you could invest in a proper upgrade to an existing machine, AM3 mobo, budget Phenom II and 2 gigs ddr3 1333. Tigerdirect is trying to get rid of old stock, I'm disinclined to assist them