Did you like the sound of the Butler if so the logical move is to get a 2 channel Butler.
Otherwise you could with that vague request and fairly large budget go down the "amp of the month club" until you find the one you want.
However if you always coveted the McIntosh, and they have that appeal, then satisfy your Mc yearnings and try it. I have a small older one which synergizes well with my Klipsch Vintage speakers (I have lot of speakers) but didn't find it's sound that appealing with most others. Just MHO of course YMMV etc. etc. A newer more powerful one may sound very different... as I said etc.
Otherwise you could with that vague request and fairly large budget go down the "amp of the month club" until you find the one you want.
However if you always coveted the McIntosh, and they have that appeal, then satisfy your Mc yearnings and try it. I have a small older one which synergizes well with my Klipsch Vintage speakers (I have lot of speakers) but didn't find it's sound that appealing with most others. Just MHO of course YMMV etc. etc. A newer more powerful one may sound very different... as I said etc.