I've been flying a Rascall 110 for about 8 mo. now with a saito 120. Plenty of power, no problem. I can knife edge from one side of the field to the other with little effort and even climb a little. Takeoff is at 1/3 to 1/2 throttle. Another quy with a saito 150 can hover his for short durations. It does slow aerobatics just fine. However, you WILL have to learn to fly using the rudder. It'll drag its tail in a turn if you dont. Gotta do coordinated turns. From what I have heard, a twin of equal displacement to a single has a little less power. (extra weight of the cylinder) Just stating what I have heard, makes sense to me though. That being said, a saito 130T should do just fine. Even with the weight of a glow driver. You're gonna love it. Its my current favorite plane.
Edwin