Go for the O.S. LA 40. I have it and it is a great engine now that i know how to start it (was turning the prop the wrong way when i first got it). But it is nice and cheap, and if you ever hate the sport (which i know you wont) you can get out without much money loss. Also, if you are getting a plane engine radio and everything get the nexstar package, because it comes with the nicer AX if you want it bad. But from what i have looked at for new planes the ,46 just is too small for most of the ones i am looking to buy

Hope this helps
Chad