For extreme listen-ability (no harshness), but with more detail, I would suggest Rosso and Audiovector.
Like Sonus Faber, Rosso has a silk done tweeter, but it also incorporates a supertweeter, which I believe adds to the resolution, especially instrument decay. SF can sometimes feel slow to me, and Rosso isn’t as sluggish. Certaldo and Volterra are Rosso models around the price of the SF Nova line. Like you, I also like the bass thump from SF, and I believe Rosso keeps much of the bass weight but improves upon the bass definition.
I believe Audiovectors are resolution monsters with their folded ribbon tweeter. I’m not sure if they would fit your requirement of extreme listen-ability, as I think of them like a dry wine. They might appear bright, or neural, to you, which you may find to be off-putting, or just fine. They won’t be warm like SF.