I have a Scythe cooler, and iv always been impressed by it. It keeps my toasty overclocked x2 in check. They all seem to come Am2/Am2+ ready and need the brackets adding for 775.
I have the Mugen 2 and it works great. I have had many skythe coolers and for the money they are quiet and COOL. The Mugen in really big and in my opinion needs to be set up in a push pull with the air flow. Push the air through it with the fan that it comes with and then get another to pull air from the other side.
I'm using the Noctua on an E8500 @ 4.0 and it idles <40 and the highest I have ever seen it go with two Prime95's running and a warm room is 56. It works fabulously but I guess it's more on the expensive end of the spectrum.
Edit: Misread the model number in the title. I'm using the 92mm version of the Noctua.