I would recommend this cooler over the Freezer 7 Pro. Far more superior cooling performance (on par with the much more expensive TRUE) for less than $40. The rebate and free shipping makes it a fantastic bargain IMO. If you can, grab this kit as well to keep the HSF firmly bolted in place.
You will be able to see a very large difference in operating temperatures with it compared to the stock cooler and the Freezer 7 Pro. Check out this page for a comparison. They used a Q6600 as well.