Yeah, I got one helpful piece of advice for the Avistar; don't fly too close to the trees like I did yesterday! I swear, that tree jumped out in front of the plane and grabbed it out of the air. Although, to tell the full story, the other fliers watching swear the tree never moved. I think they have it in for me

As for more power, an OS 46 FX would be a great engine for the plane. Then when you are ready for your next plane, get a 40-sized low-wing trainer (Goldberg Tiger2, Sig 4 Star 40, Sig Somethin' Extra) and install the 46. Put the 40 back in the Avistar which will give you a great low-wing trainer and the Avistar still can fly for those "touch and go" flying days.

Just my opinion (and is exactly what I'm doing).