You can also jump the spec a bit and not break the bank doing it.

Hitec makes a servo that works great for aileron setups. It's their HS225. They call it the Mighty Mini. And it works especially good in wings because it's less than an ounce and puts out almost 60 oz/in torque. And it's only about $21 each from Tower. I use 'em on ailerons and motor and save 1.5 ounces at least over standards. Most standards are over 1.5 oz each. Using 3 saves money too since Tower gives a quantity discount too. Saving over an ounce actually is worth doing, and these things are more than adequate for the job.

Worried about torque? Inner hole on the servo arm, outer hole on the surface horn. That insures you start with mechanical advantage for the servo. Then you adjust that rigging to get the throws you need and you almost always wind up with the servo torque mulitplied by the leverages. With out setups, you actually don't get more torque at the surface, you simply reduce the servo's effort. Basically the same thing, just how it actually plays out. Less stress on the servo and less battery drain.

I don't know of any other servo that is as good a deal and added advantages for the job than this one. Or I'd be mentioning those too.