Aircooler help mITX

Hi All,

In a bit of a pickle at the moment and need some assistance. I'm building a mITX rig, with a Gigabyte Z77N-WiFi, i5-3750k and a GTX670 (Gigabyte 2GB). However i forgot to buy a cooler for my CPU (I have the sock one). Since i don't want to go LCS since my last one sprung a leak and i'm now out almost 500 on that rig, i want to stick to good old air. I keep hearing that my board has some space issues (when does ITX not) but i'm having trouble finding any solid advice on what to get. I'm also using a BitFenix Prodigy case.

I don't have enough money to go above $80 (U.S.) so any help would be greatly appreciated.