I hope I filtered the essence of your request correctly. And you don't expect big bass.
Consider D&D or Amphion as as good as it gets in absolute terms, especially when used on the long run while concentrating more on the program than observing the speakers for themselves ( new music / mix is assessed, not speaker quality with exsisting mix / music ).
Earlier I suggested to define what a 'standard' not-that-optimal speaker would be. Decribe, in this case, those actually desired , but not so severe imperfections. What would substantiate a valid contrast against virtually perfect speakers? There are infinite posibilities and to start out even with finding the criteria will be a challenge.
I don't know how it would be facilitated in the US, but in Europe we have a bigger market for pre-owned equipment. In order to cope with the endless choices one might go out and just buy, for cheap, highly regarded speakers from 10..20y ago or so. These would represent the profile of usual equipment on the consumer side. Any Focal, a B&W, JBL consumer line, ...
Once all are evaluated in regard to those happy imperfections one might get rid of many, but keep two or three maybe?