Hey sal
Ive got a Twister that I put a Super Tigre G90 in and its the perfect combo.When I first built it I put a 61 four stroke on it and it wouldnt even pull a decent loop,I put three flights on it went home and pulled the engine straight out in dissapointment.Ive since put 10 flights on it with the 90 and love it, it'll take off in about 16 feet pull vertical and go straight up for as long as you want,and Knife edge is unbeleivable( so easy ).As far as I can see the 90 is your only option,here are a few pics.
Cheers
Weedy