hey! I like my OS 46LA! No, it's not a 50FX, but it was $64.99, and does great on my twist.

As easy as my 46LA has been to operate, I'd say it's a super choice for a trainer. Most people insist on huge motors for thier trainers because they strip thier trainers after they "move up", but I like to keep mine operational because I like flying it..and it's real good practice (My trainer is a Superstar 40 with a ten year old OS40FP that does great!).

And, I'd find someone with experience to help set the plane up, and get'er in the air. A club would be a good place to start...most will let you get a few flights under your belt before they make you join them, just to see if you like it enough to stick with it...and if you do stick with it, the AMA is a good idea, just for the insurance.