I ran a pair of B&W 703 (hard to drive) off a 1970s Marantz receiver…. It sounded great.
In my main system I have a $9,000 amp, a $900 amp and in my second system I have a $800 marantz receiver form 2011 and that $800 receiver (needed HDMI switching for the wife) is pushing 3 ohm speakers and the sound is pretty good. Good enough it makes me question my life choices lol.
My point is that the difference between good electronics and great electronics is small these days but the cost is astronomical.
As for speakers it is personal. Focal and Klipsch both have pretty strong house sounds. I have demoed the Cornwall IV a few times and many pairs of Focals though not those. Me personally I would lean toward the focal house sound. It will most likely be more detailed with consistent off axis dispersion which is important for stable soundstage. I felt like the soundstage of the Cornwall IV changed at different frequencies. They were ok but not enough to get my wallet out.
This review is of the Forte but might give you some insight to the Cornwall as these are the only measurements I have seen.
https://youtu.be/IZPc1tl1aPs