I'm interested in hearing what "the best" systems sound like, where to go?

I have my system sounding pretty good now with a wide sound stage and good depth and imaging. I hear faint details that I have never heard in songs before. It took me three amps, two CD players, two sets of speakers and room treatments to get where I am. But the rabbit hole being what it is....I can't help but wonder....do I have the best it can be? I've been to brick and mortar, high end audio stores, but they don't really have listening rooms. Do any of you know of a place that has a good selection in stock that also has a good listening room to try them out? I would like to hear what is considered "the best". I would like a yard stick to use to determine if I'm getting everything out of the recordings that I can get. Even if it is thousands of dollars outside of my budget, I would like to know what I'm chasing.