Speaker Dilemma--A Good One to Have but Confused

There are a few speakers on your list I'm not sure are tube friendly enough to get the most out of them (KEF, MA, PSB).  I think, given what you're looking for, the Spendor D7 is a great candidate.  I'd also add the Joseph Audio Profile, which is also in that price range and excels at imaging and soundstaging while sounding very natural and balanced throughout its frequency spectrum.  There's a pair being sold on Audio Circle for only $2575 ($7000 new) if you're open to buying used and don't mind some minor surface imperfections.  For a little more you might also consider the Pulsar, which although being a monitor may still have enough bass extension and ups the level of refinement over most everything else you're considering.  The Vandersteen Treo would also be very worth an audition.  Anyway, just some other options -- best of luck in your search. 

I had the Primaluna with the KT 150s, and it drove the Harbeth C7s (86db) without any problem.  The 96 watts of ultra linear power from the Primaluna w/KT150s is pretty amazing.  Keep in mind that many companies significantly overestimate the efficiency in their published specs - in this month's Stereophile there is a speaker that is specified at 94db, but itested at 87.5db)  So, a speaker with a published 90db might be 85-86db in reality.  If you can find the actual measurements, you'll be able to make a more informed choice.  

I bet you're using maybe 3 to 10 watts when listening to anything, regardless of the relative efficiency issues. I use a 12 or so WPC little tube amp with Klipsch Heresy IIIs (hard to beat the 99db efficiency these have, but subs are important since the Heresy III goes to only 58 hz or so) and it's clear and plenty loud if need be...efficient speakers do more than just play louder, they seem to dig a little deeper into the music.

Thank you everyone! I’ve been researching your re ommendatons. Each of you has added something helpful.  

The explanation on Focal’s signature sound versus PSBs Is enlightening. 

When I get to work, I’m going to list my equipment and options for the group because I’m stuck in analysis paralysis!