RE: Too many choices--need advice.
The 280BB is a much "hotter" motor than the plain 280. That is to say that it spins much faster on a given voltage, which translates to a much higher, probably destructive, current draw if it's simply dropped in in place of a plain 280.
To keep the Amps from going too high, you need to gear down the propeller more than you would with a plain 280. The end result is that you want the propeller to be spinning at about the same speed in both cases.