If money is not a issue then go with the 120, it will fit anywhere the 80 can and give you more power when needed. If you have a buget and the 80 fits for you then go for it, the motor is very dependable and can fly just about anything out there. I have never had an issue with the long spool up. I think spool up times are overrated anyway and i have just accepted it as part of the learing curve when i got into jets.
V..