If you're gaming, you could go with a p67 chipset mobo like the asrock p67 extreme gen3 and throw the extra cash at a better GPU
watercooling is a good decision if you're going to OC the 2500k (why wouldn't you )
For the H100 is the installation easy?
I hear a lot of stories about how water cooling is extremely difficult to set up and sometimes water leaks or something like that? :l
wouldn't want water dripping all over my parts D: