80, I have the Ego & for the purposes we use it for, its fine.
That is flat, regularly maintained, small/medium lawns.
The motor at 600w is def a bit under powered for longer/wetter stuff.
Id love a crack at the 1500w Victa.
I know that price is important but, I don't think as significant as other aspects such as usability & reliability.
If you're using it commercially,price alone may be a false economy. With only a few bucks diff, I would choose the one that I thought best suited my needs. If I choose correctly, it will more than make up a few bucks saved initially.
Don't get me wrong, buying the dearest doesn't necessarily mean its the best.
Good luck with your choice.