I would go for the Noctua. It matches the Thermalright Ultra-120 Extreme in performance and beats all the rest. It's quieter than all the rest. Unfortunately, the price is huge, but you said it was free
Another disadvantage is that it's big, but so are the others.
Make sure whatever cooler you pick actually fits on your motherboard and in your case.
Since you added the Tuniq Tower to the poll, you might as well add the Sunbeam Core Contact too, i.e. Tuniq's new and improved version..
Edit: actually, the best air cooler I know of is a combination of Thermalright Ultra-120 Extreme and two of the fans used in the Noctua NH-U12P. You can buy the fans separately (they're called NH-U12F). That combo costs about $100.