Aviator...my vote is for the OS.46, but don't take my word....or anyone else's for that matter. None of us have to climb the tree to recover your airplane.

I'd suggest you visit the local flying field, and see what the guys are having good results with. Internet advice is free (and you get what you pay for) but at the end of the day you should have a fine idea of what motor you want.

Used motors are a gamble, and if you don't have the dough to get what you really want today, there's an old trick called "saving up" that always works.

Get out to the local flying field, and let living proof show you the way.