Which engine would you recommend for the Model Tech Magic Extra ARF? I am wavering between a Saito .65 4S, O.S. .70 4S, or O.S. .50 2S. I want the best engine for a combination of pattern maneuver practice and mild 3D practice.

I have heard the Saito runs best on 30% Heli fuel; kind of expensive, do they run well with 15% nitro? Any comments welcome...