I agree with woodsy on the OS 40 LA. There are better engines. I picked up a Fox 45 on Ebay the other day for $26 in like new condition. A spad is going to be the cheapest, but going by your description that $80 trainer is about as cheap as you can get for that kind of plane. Please make sure you get an instructor to help you out until your ready to solo. I'd hate to hear that you smashed up your new plane too soon!