Recommendation for a warm mid/high end amp

Not sure where to begin. I currently have an Acurus A250 amp and it sounds really good. Why i'm upgrading i'm not sure. I have a B&K Ref 70 preamp and PSB stratus silver speakers. It's a great combo. The SQ is amazing on some recordings. The Ref 70 is amazing if anyone is interested. I'm thinking of upgrading the Acurus amp to something else but what? I've had bryston and I wasn't too impressed as it seemed to bright to me. Any other ideas for a neutral/warm amp? I was thinking of sticking with B&K. Krell, Parasound, Anthem? There are so many choices.

Any feedback always appreciated.