Cayin tube integrated amps are pretty good and should be within your price range. I would start with a tube integrated and may be change the dac later on.
Also, is there a wall behind the speakers? If so, experiment with a piece of dense fabric(something like a throw or a blanket) hung on the wall behind the speakers. This may minimize the midrange fatigue. If it works, you will need to think about what you will use as a permanent solution.
Also, is there a wall behind the speakers? If so, experiment with a piece of dense fabric(something like a throw or a blanket) hung on the wall behind the speakers. This may minimize the midrange fatigue. If it works, you will need to think about what you will use as a permanent solution.