Also, if you can find an i5-2500k on overstock somewhere (someone that still has one), get an 1156 motherboard. That is still the best processor you can get because of it's pure overclocking potential. I've got mine overclocked on an h55 water cooler stable at 4.85 ghz, and a friend of mine has his stable at 5ghz on an h100.

And contrary to popular belief water cooling is easy. The h55 is a closed radiator. You never have to refill it, it's no harder than installing a normal air fan.