I'm using a QSC GX5
to power my M80's.
I went for this model because it had RCA inputs which I just run straight from of the preouts of my AVR.
Some of the Pro-Amps need some type of converter box to up the signal level from consumer to pro level.
The fan inside was pretty noisy, not noticeable when the volume was up, but during quiet scenes it was very noisy. So I swapped it out for a quieter model (One of these)
and now it's silent unless I put my ear right up to it.
Another disadvantage is the lack of remote control, so I have to switch it on and off by hand every time. Of course you cold get around it by using those energy saving power-strips that switch off the other points when your main appliance is in standby, or some people have even rigged up the 12V triggers from AVRs to turn Pro-Amps on, but this involves a bit of electronic knowledge and of course; voiding your warranty. But that will happen when you change the fan over anyway.
I've never heard anything that would be classified high-end, but it sounds great to my ears.