RE: going gas???
Hey Sport Rider.
You are right that gasoline is a check of a lot cheaper than glow fuel. (at least now, they way things are going lately that might not always be the case [X(]) But if a glow engine can pull your plane that is usually the best choice. Glow engines are easier to run and maintain. You only need one battery, you don't need to worry about interference as much.
For a summary of glow engines vs gas engines (pros and cons) take a look [link=http://www.hooked-on-rc-airplanes.com/rc-gas-engines.html]here[/link].