What do you LIKE BEST about your current audio system?

The way it reproduces well recorded vocal and acoustic guitar.
I also like that I don't have to upgrade it any more, it is balanced enough. I'll just replace it at some point. Maybe.
Michael Green Audio free resonance speakers and Nottingham turntable work well together.
Yes, Bill, of course it's midrange and dynamics first.

Best way to improve the system is to replace it. If it is quite good already, by introducing new elements you create confusion and discord, so no wonder the result is unsatisfactory. If it is not yet, thoughtful upgrading works.

In fact, the only thing I would want to upgrade is wall current. It is getting worse by the day. Some conditioners and power cords help but not fully.
I have been thinking about adding open reel deck to my system, but that would not be an upgrade in a strict sense of it since I would be making compilations from records and even maybe cds. Probably not, I will most likely leave it for the next system.

I think, this would do for my next system. They work great with Lamm and Wavac electronics. 
Good price, excellent, but no takers so far.
https://www.audiogon.com/listings/lis955ce-kharma-exquisite-1b-with-klc-sr-1-speaker-cable-reduced-f...

In fact, what I like most about my system is that there are so many much better systems. It gives you a sense of perspective. It also amuses me that the best component in it is clearly Purist Audio Dominus power cord. It gives a foundation to whatever happens elsewhere.