What resolution you are at depends where the bottleneck is and it will also vary in different games. In a well balanced PC some games will be held back by the CPU and others the GPU, a PC with a bottleneck will always be held back by the same one.
fx 4100 maybe upgradeing to fx 6300 (where do u guys stand on 6100 vs i3 vs 6300? can u put in order most powerful to least?)
4 gb ram
gtx 650ti (maybe gigabyte OC version, evga or zotac) what do you think?