I bought a Panasonic SA XR 50 with an Energy Star sticker on it for my transition to class D. Not a reference piece but it can do 5.1 signals and it never gets hot. Now I run B&O Ice Modules in two sizes: Red Dragon M500 monoblocks; Wyred4Sound SX 1000 R monoblocks. Also a Peachtree Carina 300 running Hypex modules.
Class AB can sound wonderful but there is more more waste heat, complexity and weight. Not as good an idea if you run your air conditioner a lot or you are off grid.