After many years of planar speakers an my best friend having Thiels I switched to Sonus Faber: first Cremona, then Olympica 3, then Amati Traditional. I also have had some ARC equipment, now all is ARC.
I think your thinking is on point for what you have and want. I chose SF for their really natural sound. SF has made reproduced music closer to the real thing… beautiful as opposed to just accurate (think more analytically correct) and detailed. You have enough power… The real question is used or new. Unless there is some catastrophic event… not sure why service would ever be necessary… unless after thirty years.
‘’The performance of models when moving up the SF hierarchy goes up. So, the performance level if you could get maybe used Olympica 3 would be a good way to go. Depending on how fast you want to move, that might determine which course.