I think it is helpful for a decision when we realize that we should take care of the following:
Amplifier power / Quality of tone
To buy power is no big problem, to buy good sounding amps generally is a bit more difficult and to look for good sounding high powered amps is a task. Not easy. Depends of course what the owner is looking for but low sensitive speakers can make life difficult sooner or later but see it with a car explanation, a low efficiency speaker is like a fat car, for example a Mercedes 500, your amp is like an engine. When you accelerate straight on, all is fine but when you drive small, curvy rads with a lot of speed changes, the MB500 can do that but it is work and you will feel, it is not made for that (Some say their System sounds better with some kind of music). Even with a bigger engine you have to move high mass (car weight) Same engine in a car with half weight (= a high sensitive speaker) and all those accelerations, curvy driving is easy like breathing. You have much more fun with driving, or with listening to subtle details.
