How about a Beeman. I have had the R1 for about 10 years now and WOW! What a air-gun. 950fps in a .177 Cal. Botter than a 22 (ie. quiet!). I tried many "air gun" scopes but the recoil kept braking the cross hairs. So I put a Lupold Scope on it so nothing is safe. Pretty pricy though.
http://www.beeman.com/ 