I guess you have to decide if you want to get into the higher end and, if you do, how you want to get there.
What I was trying to say in my earlier post was that you don't know how good or lacking your speakers are until you get an amp that will grab the speakers and tell them exactly what to do.
For $4000.00, you can get yourself a really good high end amp that will do that. I don't see one listed here, but call Mark at Reno HiFi. I think that you might be able to get a Pass X250.5 demo or refurbished in that price range.
If your electronics aren't up to the task of really controlling your speakers, you'll never know how good or lacking any speakers you get will be.
Then again, they always say to choose your speakers first. If you're going to do that, make sure that you're hearing them in as good of quality system as you can so that you can hear their full potential.
Chuck