I would go with the Kyosho Super Stearman. I just finished this combo and am now waiting in a break from the weather to fly it. From what I understand this is the perfect engine for this plane. No you are not going to bore holes in the sky and have unlimited vertical but it will fly like a Stearman is supposed to fly. (BTW the plane is relatively light not sure how many lbs. mine came to)
Have fun in your decision
Tim