Only Hitech servos are programable. And it takes a special programer. Spend time comparing servos at Tower you will find they have lots of different features. Probably the most common GS servo is the Hitech 5955. It has a coreless motor, Titanium gears, very small centering dead zone. And the gears stay tight for what seems forever. It is programable. It can be used in just about any plane. Futaba and JR have recently come out with servos with more torque but for me, I'd just use two 5955s in stead.

Futaba,JR, Hitech and most all others plug into dx7 recievers. With Futaba you will need to snip off the tab.