A .91 will fly it, but you won't be doing much in the way of 3D. The new Saito 125 is better than the 120 (weighs less and has more power). My friend and I both put our 5-cell receiver packs in the tail to offset the weight of the motor. I still added about an once of weight in the tail to balance on the recommend CG for 3D performance. If you have any question about it, let me know!

Jason