I have a Hyperion P51 ARF that a buddy gave me to repair after a nose dive. I had a OS 32 in it, but it really needs a bigger engine. I have been looking at .40 sized engines like the Tower Hobbies and Thunder Tiger stuff. I really want an OS 50SX, but they don't make them anymore. I need your recommendations for something lightweight and powerful (a Jett is not an option, too much $). Give me your thoughts.