Starting a second system, need efficient speaker suggestions.

I would search in a page like: 

"OP:  what are your current speakers, and how is your Cary integrated doing with them?"

I don't have the Cary yet, maybe Monday. Current speakers are Magnepan 3.7i with a Hegel H390 integrated. 

I'd like to try the other side of the audio coin, tubes and higher sensitivity speakers.

I'll try the Cary, but I'm afraid it won't be up to the task.

Cary SLI80HS paired with Volti Razz at home for me. Awesome combination in my book. When I picked up my Razz from Greg at Volti he threw his Cary on my Razz as well as a pair of Rival and his new Vittora prototype. IT was a pretty fun experience. Plenty of power for all three pairings. (of course they are all high sensitivity). Open, sweet, musical and gobs of dynamics. IMO really hard to go wrong.

Also agree with @elliottbnewcombjr ultralinear is the way to go. I switched back and forth for the first couple of days. I just leave it now.

OP, the pair of Razz @mapman found for sale on The Music Room's site  look great !  Priced right I'd say, may even be able to bring them down a bit. 

I don’t have the Cary yet, maybe Monday. Current speakers are Magnepan 3.7i with a Hegel H390 integrated.

I'll try the Cary, but I'm afraid it won't be up to the task.

86db/4 ohms? Maybe not, but still, in push-pull 40 wpc triode, I do not think that you need as judicious with efficiency as you would need to be if you were buying speakers for a 15 wpc SET rig.