Any thoughts on the Bel Canto M 300 amps? Red Dragon M1000 MK II ?

Tons of power, never in doubt. The Bel Cantos replaced a B&K amp that was 200 or 220 wpc, and the BCs seemed more in control and just as powerful. I had graduated from an 80 wpc NAD, which was also good, but you get addicted to big power. I haven't had tube equipment in 40 years, but I can say that the BCs are musical and not etched. And not bright at the high end.    I think the preamp has a lot to do with it in any event. 

I have owned both the Bel Canto M300 and S300. I think they sound great and love the simple, understated look. I also have owned and still do own the PS Audio Trio A-100 amp. These amps use the same ICE modules and have a near identical sound. The PS Audio amp is a bit more versatile that the Bel Canto as it can be bridged mono. 
Now, the shocker to me is, the PS Audio can be had for much less than the Bel Canto amps. In fact, I'd bet you could by two C-100 amps for less than a pair of Bel Canto mono amps. You'd have twice the power with more versatility. You could run two C-100s in bridged mode or bi-amp them.
Cary also made an amp with the same ICE modules which is usually priced similarly to the BC.