I currently have a Hitec Optic 5 iirc. 5 channels, failsafe and two antennae for range and reliability. The fifth channel is a button in the side, ideal for flippers/spinners that use solenoids.
-I'm not too experienced on servos, so I'm not the best to comment. However, they seem like a good size for a lifter if you're using two.
-The battery looks a but lacking in power, I should think...