It is true that the 2500 generally outperforms the 4100, but with stock cooling the 4100 can hit 4.4GHz and stay nice and cool. That would allow it to match the performance of the 2500, So overall I would say your best bet is the FX-4100 kit, because you'll have the better video card and ram. (Note: I have and FX-4100, and I run a stable 4.6GHZ with stock cooling on all four cores) If the Intel build were a 2500k, I'd say hop on it