For gaming, Intel CPU slaps AMD around..Theres proven guides here in tomshardware to tell you everything you need to know. But, it's your choice, not a bad rig.
Actually its pretty well proven that Pll chips are more or less equivalent to C2Q in gaming and both of those give better results in midrange systems than intels latest and greatest Ci7 does .
The OP's system looks good to me . The only thing to check is to see that the 4850 X2 fits in the case . Its a very long card