Many are talking about a Phenom II X4, and there is certainly nothing wrong with that choice. It's especially attractive when we consider competing throughout the whole test suite, not just games.
While available again, PH II quads are still a bit more expensive, and that funding comes from where? A Boxed 965 BE is $110, (same as the FX4100). The stock PHII cooler is loud, but would likely take the chip near 3.8 GHz. Alternately, an oem 955BE is $95, add $10-20 for a cooler as desired. Either way, we are dipping into our GPU and Mobo budget. I’d want to break budget a bit to do the platform justice. I’m not crazy about an AMD build (Deneb, or Zambezi, or Llano) forced to use a $50 mobo and CAS 9 DDR3-1333.
Anyway, my take on PH II X4 is this: power consumption would be way up, noise and/or cost up, productivity (overall) once overclocked would be way up, the machine's overall "score" or value standing vs. the other two machine's would also improve (requires more cores).
However the focus here was gaming, and I suspect little difference in 3 of our games (BF3, Skyrim, and DiRT3). StarCraft II though, our testing has shown even a 3.7 GHz X4 980 trails the G860 by about 10%. We'd probably need at least 4.0GHz to match the G860 in SC2.
Bottom line, we have now seen what Intel has to offer gamers at this budget. If we shift focus towards all-round performance, not just games, then we need more processing cores. We can't grab 4 Sandy Bridge cores and maintain our GPU funds, so attention must shift towards AMD.