Dual Core processor at minimum; 2gb ram at minimum; 64mb video card at minimum. Likely, 200gb hd space at minimum...

Not too bad, RAM is dirt cheap now (no $5/mb anymore), HD space is cheap (get yourself a 750gb hd for under $200; which is insane, i bought my 500GB hd for like $500!)...

Processor will vary based on if you want to be AMD or Intel; which will decide a lot more...

Myself, I'd go AM2 processor, Dual Core, 2GHz+, 2-4GB ram based on what you can afford. Some motherboards support up to 8GB ram... I remember when they just started 8MB! lol
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