Sangeet Khatri :
I would personally have got for the 750K because the 760K is nothing but just the 750K but a bit overclocked.
I realize this thread is a bit aged, but I stumbled on it doing research on the 750k vs. 760k.
The 760k is not just an overclocked 750k. 760k is a Richland based CPU, where 750k is Trinity. While there are not many differences, there are a few, most notably:
1. Native support for 2133Mhz Ram for Richland vs 1866 for Trinity
2. Improved, more efficient turbo boost algorithms, theoretically allowing Richland to spend more time at its turbo-boost speed, which also probably allows for the higher clock-speed at the same TDP.
3. A few additional features, mostly having to do with home media viewing & streaming, that AMD has incorporated into Richland. It's not clear whether these features are supported by the Athlon CPU-only chips or not. Plus, this feature-set will most likely be motherboard dependent.
But 1 & 2 above may be enough to select the 760k over 750k.
References linked below:
http://www.techpowerup.com/185732/amd-athlon-x4-socket-fm2-cpus-based-on-richland-silicon-go-on-sale.html
http://www.extremetech.com/computing/150451-amds-new-richland-apu-boosts-clocks-and-adds-features-but-its-a-just-modest-refresh
http://www.overclockers.com/amd-richland-a106800k-apu-review/
So, while there are not major architectural differences between the 750k and 760k, if I were buying today, I would opt for the 760k for latest tech and capabilities that Richland has to offer.
You may still choose to go with the 750k. My only point is that there are some additional differences besides just being an OC'd 750k.
But I also agree that 750k is fine driving the 7770.