John, as per Dr.Toole's calculations, I will be getting a higher dB @3mts from the speakers than the number calculated by me. This goes on to show that XPA 3 would have enough headroom and be able to play speakers at deafening sound levels. XPA 2 clearly has more unusable power and headroom and therefore, a waste considering the high sensitivity of m80's.

Thank you all for helping me decide.

There are times when you can afford .......... but cannot buy!!