Power? Power you say, well my son, it's the gyroscopic effect of the wheels that keeps it up. More than I can say for myself at this age
If you've seen the current brushlees motors out there you'll be pretty convinced that they are fast fast fast.
The only thing I see for nitro is a Nuova Faor (Italian) for $500 designed for a .12-.15 engine, or a Pumilio (Finnish) for $700 designed for a .21
Power and acceleration really are not interchangeable terms. What I look for, and this is personal taste, is a realistic looking model. If I were a machinist, or on speaking terms with my father-in-law, I would have one built from a design of a Ducati