I use the 9650 but its around 60 bucks however I read on other forums that people use 3154 for the tail might wanna try it. Its cheaper than the 9650 and smaller too. When I get my 3rd heli I will use the 3154 for the tail.

http://www.futaba-rc.com/servos/digitalservos.html

http://www2.towerhobbies.com/cgi-bin...?&I=LXNCW1&P=7