**Caution -- opinions below --

The Evolution is a very good motor based on 20-30 flights w/ one of my students' planes.

If the budget permits, I'd go w/ an OS .46 FX (if you can find one) or an AX.

I've not had good luck w/ setting up Magnum .46's and Tower .46's - the OS and Evolution are great right out of the box; I know that both will set up easy, start easily, and run reliably and powerfully, even if the installation isn't perfect.

The long term is important too -- The Evolution will probably be fine - just no long term data on it yet -- I'm certain that the OS will keep giving great power long enough to outlast several airplanes.

Just my $.02 --
Rick