Theres honestly not much of an "upgrade" to be had anywhere. Getting a kaveri a10 would be the only thing worth your time. The a10 is already stronger than the athlon x4, but frankly 100w tdp is going to be tough to get away from (thats reasonably low tbh[amd wise], the fx chips are quite over that in most cases minus those weird power saving ones clocked down super low).
But yeah, on that chipset, the a10 7000 series will be the only real "upgrade" but that is a relatively huge graphical upgrade if you need it. I would think you were better off with a discrete gpu tbh.