Perspective for consideration: A non-hyperthreaded haswell core from a pentium, has about the same IPC as the 2 cores combined in an L3-less PileDriver module. A non-hyperthreaded haswell core from an i5, has about the same IPC as the 2 cores combined in a regular PileDriver module (with L3).
The i5 has at roughly double the effective performance per clock compared to the 750K. The 750K comes clocked higher, and can be overclocked further to compensate for some of this, unfortunately, even if you manage to overclock it to 5ghz, it will only be in the territory of an i5-2400 (sandy bridge) performance wise.
Either way can be a very good value though, as the 750K/760K are generally dirt cheap CPUs, so the added cost of an HSF can still come in at a price similar to an i3 (closest competition IMO). With some decent overclocking (which can be fun to work through), the performance of the 750/760K can trade blows with the i3-4130 depending on the workload.
If the budget has room for a "locked" i5. The closest competitor from AMD is actually the FX-6300+HSF. The FX-6300 on a proper budget overclocking board (UD3P) with a ~$50 HSF can typically do ~4.8ghz, which offers a performance level that, while insanely inefficient by comparison, can indeed trade blows with a locked i5 for a similar implementation cost. The FX chip is more fun to tinker with and performance tune (if you enjoy that sort of thing), while the i5 offers out of the box plug-n-play excellence.