I'm using Hitec HS-325's on all my 40 size planes. It's cheap and does the job. However, I ordered an Aero-Works Yak 54 1.20. That I'm planning to put Hitec HS-5645MG's on all surfaces - which should be minimally enough. If your also flying helicopters like me - definetly FAST/High Torque Digitals all the way.