Hey skinut, glad you asked. I've built and flown the same airplane and really enjoy the 25 size engine, it really zips around. About the servos, for me I've put the HiTeck HS 82 MG servos. They are small, but strong enough to do the job very well. I've intentionally used the "MG" servo because of the metal gears. The gears are strong and hold up to abuse. Powering the Sig Wonder with a 25 size engine is going on the upper side of power for that plane, so I opted for the stronger servos. I've never had any troubles with them. Good Luck!! Merry Christmas!! Mikie