The OS .46AX is very hard to beat a good combination of power and user friendliness for the engine.

In regards to a spinner I would not use a full spinner at all particularly a plastic one. These typically don,t last very long in the training evironment and can become very ugly quickly with starter burns. Instead a spinner nut like these is not only better looking but much more practical and make a prop change very easy and quick. They replace the nut and washer on the engine.

http://www3.towerhobbies.com/cgi-bin...&I=LXE158&P=ML

John