i have an electristar and i also have a 2nd motor and esc that i have in an airboat. i'm thinking about the hobbico twinstar
http://www3.towerhobbies.com/cgi-bin...&I=LXJPH0&P=ML
should have plenty of power since it recemends 25-40 motors. i have 4 packs of the 2 cell 3200 lipo and 4 packs of the 3000 nimh's. a guy at my club has one of them, but i've never seen him fly it, should be able to check it out good to see about battery placement, if their is enough room for them or not.