What do you intend to do, at what resolution, with what level graphics.
The Athlon X4 760K is a two module four core processor, does some multicore processing vey well, and is highly overclockable. Also Kaveri is a kind of improvement but sidestep, so no further upgrade seems likely.
Overclock needs a better than stock cooler for best result.
I3 4140 architecture gives better single core performance, dual core but some programs are actually being written to use hyper-threading, I5 andI7 upgrade path.
With limited overclock stock cooler is useable.
Kaveri is more expensive than Trinity, and having some glitches with the 7850K, which may or may not matter.
In part performance is close enough to follow personal preference. The FX-6300 at $110 is mostly considered more desirable in the AMD camp.
Again, what you intend to do is needed for a definitive answer.