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I'd go mum & pup custom (cause they're insured if it gets zapped during building)
I'd opt for an Intel i5 or higher
GeForce GTX 520 range or higher
4 Gigs RAM
Motherboard that still recognizes Windows XP drivers
and let the shop opt the rest.

If I went prefab (which I usually don't like to do), i would try out AlienWare.