Classe CAM 350 monoblock vs Classe CAM-400 or Bryston 4B3

I am looking at two Classè audiogon postings. A Classe CAM 350 monoblock ($4,449) vs Classe CAM-400 monoblock ($4,900).

I don’t know Classè amps all that well but the earliest reviews I can find for the CAM 350 go back to 2001. The CA-400 may go back to 2009, when was the CAM-400 last made? I don’t know. Any differences in reliability or performance?

Should I assume both need to be recapped? Does one amp run hotter than the other? Is one Class A the other class AB?

Are there any Classè experts out there? I’d guess for the newer more powerful CAM-400 and extra $450 is not much of a difference everything else being equal.

As an audiogon virgin, having never bought or sold here I don’t know that “everything else is equal”.  I don't know how much to trust what I read.

All source material will be FLAC files. Speakers are Magnepan 3.7i about two years old. I know I love how Classè sounds but I worry about the heat making the room unlivable.  My taste in music is eclectic, almost anything except rap.

Perhaps the cool alternative would be a used Bryston 4B3 which Audiogon has 4 for sale at $4,100 - $4,500, any of which would have to be newer and less expensive than the Classè amps.  I have never listened to Bryston 4B3 on magnepan 3.7i speakers.  I don't know if I would like it?

A little guidance for the blind, but not deaf, yet, please; thank you.