With respects to how long you’ve had your SF speakers, i can for sure say that IF you get those Wilsons, you will sooner or later have next itch, what happens with a separate power amp. No matter how nice you think the Gryphon is, a separate power/ pre will get you to next step. I have been in this situation myself. It just never ends. Also, a system is so room dependant so there is no way you can compare those speakers without swapping them back and forth in same environment. Have you ever visited a true state of the art room acoustic center? I say you will be utterly amazed when you realize what room acoustics do.
What kills most of the overall sound is room nodes (bass peaks and dips).
These are also not solved with the typical room acoustic devices (bass nodes).
If you measure, you’ll have the facts clear. So again, consider listening in your room and also consider if you possibly will ask for a new power/pre amp in a few years.
I personally quit all hifi for years and years because i got OCD. Nothing mattered but the system and it’s updates. 10 years later i still pay for stuff i don’t own (sold it all).
To reroute back to you, who you are will determine how you behave with this hobby. 18K is alot just to change speakers in less than ½ year.
