I have the Brison 3.2 and was very pleased with it until that trainer took out my Edge 540.
20x10 was almost 10,000- rpm. The 22x8 was much better. Due to the electroic ignition, the weight is very light.
I would also look at the ZDZ line and RCS line at
http://www.rcshowcase.com/
I have the ZDZ 80 and very impressed with engine and service.
Good Luck,
Twinman
PS Stay away from trainers.....trust me!!