Lots of people recommend the Gemtech Outback, I was'nt into dropping 600-800 on one including transfer fee, and transfer tax. So I bought a TAC-64 from Craig Wheatly at Tactical Innovations, www.tacticalinc.com . It's a great little suppressor, I paid $400 for it including all other associated fees. It's got a first round pop if you shoot it dry, but a little lithium grease takes care of that. Plus I had my 10/22 threaded and it works well on it too. Craig has a newer improved model out now the TAC-65, wish it had been available when I bought mine, but oh well. I also give Craig my highest recommendation as well, great guy, great product, and great service.
Ah! Just remembered the Tac-Ord Wildcat XL, is another one that I see recommended alot. You might check all those out, and get the one that you like the best. I don't think that you'd go wrong with any of them.