Recommendations for under-cabinet/compact amp?

I have need for an under-cabinet amp, and separately, need or an amp that would fit in a small bookcase. The first is for me. I seek to mount David Visoniks under a kitchen cabinet, and mount an amp in between them (preferably integrated, but possibly separates if small). The second would be for my father, who now needs a compact size that would fit on a bookcase. Although the kitchen system would not be for hi-fi listening, we are used to hi-fi in our other systems, and low quality would be noticeable. New or vintage, interested in all. Budget 1,500 or under, preferably under 1k each. All thoughts appreciated.