Well, you are definitely a good "candidate" for gasoline engine power, and once you try it you will probably love it and never go back to anything else. I convert all my gas engines from lawn equipment, chain saws etc., so I will let one of the other guys in this forum recommend an engine. The Zenoah is a great engine, but pricey as you say. There are other options in ready to fly engines these days.

If you are quite handy with mechanical things, you might check out the "conversions" forum.

AV8TOR