Well, any of the others referenced should be perfrectly fine.
They may not cool quite as well, but at 3.2ghz, you are still not trying to reach extremes.
As others stated, you are still in an OK range, though I understand wanting to bring down the temps some.
If you can cut back CPU voltage even a small amt, you should be in a very comfortable range.
All the others ones listed in this thread are great too and more than you need. The artic7 pro could work too and is in the $30 range. This would also work since the speeds you are trying to reach are not extreme.