Your build didn't post.
Oh, thats weird. Here it is!http://pcpartpicker.com/p/hrF4Bm
As a build, that looks good. For cooling, it all depends on what clock speeds you want to reach and what your budget it. "not CRAZY expensive" isn't enough detail.
I don't plan to overclock at all, and budget is about $150 if I even need a cooling system.
You don't need a cooling system, then. The stock Intel cooler that come's with the CPU will be fine.