matt,
I agree that gas is probably the overall cheapest way to fly. I never considered large electric, because the battery cost is overwhelming. Most fliers don't fly near enough to even be in the same ball park cost wise with glow. The question I have is: do gas two strokes throttle any better than their glow counterparts? I've been using an OS140 for 5 or six years now (same engine) adn I like it's ease of use, but I like the instant throttle response you get from 4 strokes better. Especially when your backing off the throttle. Sometimes my 1.40 "winds" down more slowly than I like.
Jeff