I used a McIntosh MC2250 for years when driving my less efficient JSE Infinite Slope Model IIs and listening at higher volumes than I do these days.
Rated conservatively at 250 wpc, It tested accurate to 305 wpc by McIntosh Lab technician (anybody remember Lab Days at Harvey's, NYC?). They advised me to leave it at full volume and use the preamp volume which I did. It was simply invisible, totally silent brute, did no harm. I have a 3rd meniscus tear in my knee thanks to moving the 80 lb beast from a low shelf while poorly positioned.
Anything McIntosh, if you don't go for the silly distracting meters, you save a lot of money.