Looking at a MPA470 that does 70x4 and 210x2 @4ohm, which I would run at x2 to get 210. Or the Eclipse XA4000 that I'm currently running at 250rmsx2 @4.
Mmats typically have matched components making them high end quality wise, but as long as your amps are the same class and not cheap junk im not convinced you'd hear the difference. But, i have always powdered the mmats stuff over eclipse amps, even the ice ones...