$3500 floor standing speakers used. What would be your choice ?

@inna 

Given the limited amount of power you have on tap, would a good pair of bookshelf speakers paired with powered subwoofers make sense in your environment?

That would make things more complicated and probably more expensive. Integrating subwoofers can be a challenge. I like coherence. But theoretically yes, I have enough room for that.

60 good tube watts is not little at all for a medium size room. The amp sounds quite powerful with the current speakers.

A few years ago, based simply on the many glowing reviews, I bought a lightly used, $17K pair of bird's eye maple GamuT L7 speakers for $4K. Powered by a pair of Pass Labs XA-160.5 amps. I'm very happy with my purchase. The tough part is that I've only seen one other pair come up for sale since then. Good luck and happy listening!

Vandersteen, Paradigm, SVS, KEF, Monitor Audio, B&W, Klipsch