I noticed that you own a H77 board.
According to Intel, " Intel H77 Express Chipset also enables overclocking features of unlocked 3rd generation Intel® Core™ processors."
So, I'm not sure if you can overclock your i5 2500k with it. IDK, maybe you can get a moderate overclock with the H77 board, for which a Hyper 212 Evo would be a good choice. http://www.newegg.com/Product/Product.aspx?Item=N82E168...
ah alright, well good thing i was still just working on a build and haven't bought all the parts yet (phew). so I switched some things around, mostly just the chip and the mobo. also newegg is giving me a free chipset fan for whatever reason, so i guess the actual question now is, will said CPU cooler fit with this new build