4 GB RAM, Phenom II Quad Core (cheaper than Intel), Radeon HD 5770, (no new monitor I assume?)
With the above (not even top of the line) you can max out almost anything....
On NCIX all that with other default necessary parts totals up to...
Oh shit $821. 3:
Er... looks like anything less than $600-700 won't be all that worth the money and effort.