I’m running two amps (Pass Aleph 0s and Audio Note 300B). I have tried 2 models, Zu Soul Supremes which I found fatiguing (shrill, bright, glassy?) after a brief honeymoon period and Audio Note AN-J/LX which I am currently running and which I love. The right mix of detail, warmth, fullness, richness, realism for me and they have scaled surprisingly well with every upgrade I have made to my sources.
I purchased most of my system used, so investment amounts are somewhat misleading, but at this point the speakers are probably only 10% of my total system cost (analog and digital sources). And yet they don’t feel like a bottleneck but rather bring out every upgrade to the sources.