Well I suppose if your looking for a full time heater Class A is the way to go..
How about a Parasound do a little research pick one of their modles and be happy.
It's a Class AB I'm sure, a reasonably priced product that sound really good 3K shouldn't be a problem..
The right class D makes the difference.. The question is the cost.. I used Nord One Ups.. I'm quit happy for the the 4 month a year I run them..(Summer)
Regards