The older Krells (KSA 80, 100, 200 and References, as well as their monoblock versions) were about your only choice back when Apogee was in business, a major reason they used to be demo'd together. Would expect them to still sound good as a combo. Don't know what's available now, but I'd expect a pure class A design might fill the bill (Gryphon?). You might want to check the archives for a link to the Apogee users group website, I'm sure they'd have plenty of suggestions.
