you got an h67 motherboard, don't upgrade to i5 2500k. If you do upgrade, consider i5 2400. If you like the cpu cooler so much then use it, it won't make a difference but. meh, wth. I personally like to put a little better than stock coolers in systems for various reasons that don't always have to do with cpu cooling itself.
Did you read my previous messages? It said: "until I upgrade to the Ivy Bridge version of the 2500K
and Ivy Bridge supported motherboard