I have and am going with the JR st125mg servos, looking for something high torque for the rudder like the JR ds8611a which might be a bit much but doesnt seem too heavy at 2.24 oz with 320 oz/in @ 6V and a light weight for the throttle, how much torque does one safely need on the throttle.

Does anyone have any ideas on light weight RX batteries, sounds like around 1700 and up is the norm