I have the Sig Cap with a Supertigre 2300 and Conley Mega carb and Bisson Pitts. Plenty of power and very reliable. The ST engines can be a problem - carburation. I'd use the OS 1.60 for similar or more power and you don't have to worry about the carb. Keep the plane light. I made a new dihedral brace from good aircraft ply (stock piece is crap), I glassed the wing center section, and I put bass wood rails in the wing for solid servo mounts. The stock servo mounts with the potato chip covers results in aileron flutter. I used coreless 42 oz-in servos for the ailerons and Rocket City hardware and there is no flutter.