The best I've ever heard were $400,000 a pair. It was a $1,000,000+ stereo at one of my Ferrari Clients ' houses. He owns several Ferrari's , anyway ... They are 7 and a half feet tall, look like a tuba bell for a bass driver, trombone for a mid and trumpet bell for tweets. Hooked up to custom made class A giant amps of a triangular sort of shape that were oh, 2 feet high x 2.5 feet long and where he has 3 amps per speaker running off of custom wound speaker cables that are 2" in circumference with hand made silk sheathing on them coupled to a 900 lb Turntable, that had a 85 lb platter, that had 5 holes drilled in it, with vacuum tubes of surgical rubber that sucked the albums flat from a vacuum system mounted in another room in the house ( so you wound't hear the vacuum hum ).
The owner warms the amps up for about an hour, has the temperature and humidity controlled at set parameters and has a "sweet spot" chair bolted in the "sweet spot" location.
Other than that ...
Phase technology
Snell
ADS
Martin Logan
Magnapan
are my five picks, put as someone else eluded to, the list could go on ad infinitum !!!!!!!
Some higher end stereo stores will let you take speakers home to try out in your house on your stereo, without buying them, because every speaker and room and what kind of electronics , etc... are all different. Certainly you won't be able to tell how they'll sound in an audio store very well, because one, their room is different than yours, normally when showing any speaker , they'll have a sub hooked up in the display to make you think the bookshelf speakers are better sounding than you think, their electronics are different, speaker runs are longer and many other variables that makes choosing a speaker in a stereo store and expecting the same results at home are near impossible. That being said, the more consumer based stores all have a 30 day return policy, so find something in your budget, buy and try them out , if not what you like, maybe try them with a powered sub or better speaker wire or swap them completely for a different speaker set.
like some one else said the variables are too wide and your ear hears different than my ear and your likes of maybe highs and how they should sound to you are different than mine, etc... the list and amount of right line conditions when asking a stereo forum will end up running and getting responses from now until the second coming of Christ.
the best thing is just go try some and see how you like them and keep trying until your happy, which also make take a lifetime ... !!!