HS55 Speed: 0.14 sec. @ 60 deg, Torque: 1.3 KgCm, weight: 8 gm, cost $13
HS65MG Speed: 0.11 sec. @c 60 deg, Torque: 2.2 KgCm, weight: 11.96 gms. Cost: $35.

The 55's will work ok. I flew with them as a student but have swapped out to HS65MG. The 55's are perfect for airplanes. Considering the cost difference for (3) servos ($66) it's probably worth it. However, Don't be afraid to fly with 55's.