The two alternatives I most like are the .75 AX and the Zenoah. The thing that worries me about those two choices are underpowering with the .75 AX and overweight with the Zenoah. I dont really care about hovering. I'm not much into 3D. I like precision aerobatics and have to take into account that I'll be flying at over 7800ft above sea level where engines get a considerable cap on their prompted potential.