i have flown the Sickle for three years and love the beast. I think the OS25Fx is an excellent choice, starting easy and powerfull enough for the plane, but stay with the 9x4 or 9x5 at most. The OS.32Sx should be an absolute great choice too, power and not too heavy. My Sickle flies easily from the hand, no special launch required. Take extra Prozac and clean shorts if you go with the .36 and above. what a rush that will be.