ORIGINAL: ArmedZagi
Take a look at the OS 55 ax [link=http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXNMD1&P=ML]http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXNMD1&P=ML[/link] Sounds like what your looking for.
I bought one of these and it is excellent. It fits in the same space as a .46 but has a little more power. The thing runs nice too without needing a lot of tweaking.