Hey sorry for no one answering your thread. Anyways my input is to go for the air cooler, I myself am running an Antec Kuhler 620 which is a closed water loop cooler and I am quite paranoid with it leaking over the video card which is more expensive than my CPU
Anyways what's your budget for a cooler, I think I can find you a much better air cooler.
Edit: Oh yes, forgot to add that I bought my water cooler for $60 dollars and the Hyper 212 which is about $30 dollars performs within 1-2 degrees which shows I wasted my money. That being said what computer case do you have right now? I need to know the computer case to find its width so I can see how tall the cooler can be for it.