One problem with the FX CPU's is they tend to have a much lower MINIMUM frame rate which can be very obvious at times. Even if you find the right combo price that showed the AMD setup got a little higher frame rates I don't think I'd recommend that.
Another issue is that a slightly better Intel CPU with higher cost might last a bit longer when you likely find the money to get a better graphics card in two years. Of course that's a little less budget now for the graphics card so it does get a bit tricky, especially considering some games will run BETTER with more GPU power, but others will run better (at least less stutter) with the better CPU.
I could also help a bit more if I knew the TOTAL BUDGET as it sounds like you're building a...