Bookshelf speaker recommendation

Would definitely consider Buchardt Audio S400 MkIIs. They are about $2,100 per pair with various veneers (I have the Rosewood which are stunningly beautiful), ship for free, and come with a 45 day trial period with a $100 restocking fee should you decide to return them. Amazing speakers, just read or watch the multitude of positive reviews…..worth the audition

Can (and prefer) to be placed close to a wall with a rear passive radiator, though I’d use a set of drum dampeners to decouple them from the shelf. Small sized at 14.5H x 7W x 11D

KEF LS50 - hands down (although they are they are technically stand mounts, not bookshelf).

I have had quality speakers before in a similar room to yours (Klipsch, Polk), with a Peachtree Nova at the time, but the KEF's represented a MAJOR step up. The soundstage and transparency are unmatched at this price range. Their Single Apparent Source technology is real, not just some marketing gimmick.

Do you think after 7 years the OP is still lookin'?

Take a look at Aerial 5T. I have an earlier iteration, the 5B, and drive them with a Peachtree 80W hybrid. Wonderful sounding speaker and my favorite bookshelf model. Good luck!