Vortex
Kaos,
A friend of mine has one with a 91FX in it. It is not a fast airplane. The Rossi is obviously a lot more powerful than the OS but I really don't think you will have a bullet on your hands even with the Rossi.
The Vortex is really a very nice sport plane. Easy handling, nice landing. The same fellow also has an Enforcer and I think the Vortex is the better airplane.