I searched, and didn't come up with the answers I wanted.

What is the best gas engine for someone switching from glow to gas? I am thinking of something in the 50cc size. Possibly a DA, 3W, Brison? Any others that are recomended? I know there are others, but these seem to be the most popular. I will be putting the engine on a scratch build Edge 540, and I do tend to build light. Is there anything I need to look out for in these engines or any other ones that get recomended? My local hobby store doesn't stock any gas engines, so I will be mail ordering whatever I decide on.

Thanks, Steve