Hey Ben,

I used a OS 160 in mine and it does ok. I sold it to a friend and he is using a Moki 210 and it flys it with authority. Zac West also used a Moki 2.1 in his and it hovers fine and still has good pull out. It's not as expencive to run as you think. You only run .it on FAI fuel and that comes by pretty cheap like 12 or so dollars a gallon.

I had my old midwest cap layin around and put a Moki 1.8 in the nose. It's slightly bigger then DPs Extra and weighs about 14 lbs and that flies that perfect. Dont forget the Moki has over 4hp, and is very light!!!

Just my suggestion..

Later,
Frank