Here are three recommendtions to consider;
1. Buy another 4004MkII. I liked the one I owned years ago and for $600-800 used, they offer good sound quality IMO.
2. McCormack DNA 225 at around $1,500 used, and sometimes less,
3. Hypex Ncore NC400, either a pair that someone has made DIY, or purchase the modules and cases and put them together yourself.
1. Buy another 4004MkII. I liked the one I owned years ago and for $600-800 used, they offer good sound quality IMO.
2. McCormack DNA 225 at around $1,500 used, and sometimes less,
3. Hypex Ncore NC400, either a pair that someone has made DIY, or purchase the modules and cases and put them together yourself.