Keep a look out for a pair of pre-owned Tyler Acoustics Taylo Reference or Tyler Linbrook monitors. These are equipped with parts and drivers normally only found in >/= $8K/pair speakers. I recently bought an early 2000s pair of Taylo Refs that came with the upgraded Seas Excel (gold ring) tweeter for a mere $600. From about 60Hz on up, they are quite easily the best monitors/bookshelf speakers I’ve owned and among the best I’ve auditioned at any price. They will easily walk all over some of the $6K/pair dealer-sold bookshelf speakers and compete well against speakers like the B&W 805 D4s.
Pretty much any brand new box store/dealer-sold speakers under $2K/pair sound like distortion machines relative to the aforementioned Tyler speakers.