Go with the 60 sized, and a ST G90.. IT will be easier to see and fly and it will make you look like a better pilot because it'll be more gracefull... I have an ST G51 and I love it! It swings an 11x6 at 13,000! And this is the ringed version! It's not even leaned out! Hovers myy 6lbs. trainer at 1/2 throttle... I would recomend the ST line of engines to any one.. I'm even gettng the G2300 for X-mas to go in an Ultra Stick Lite... My .02