Air Cooler: you may find a 140mm tower cooler in your price range (Xigmatek has one, that was only $30 here until it went out of stock), otherwise I generally recommend any 120mm tower-style cooler other than the frequently parroted Hyper212 EVO. That one is not a bad cooler, however competitors including Enermax, NZXT, Masscool, etc. often have similar coolers (+/- 1C-2C depending on fans) for considerably less money. This makes the Hyper EVO bang/buck Loser, and I prefer not to recommend Losers.