Bookshelf Speakers?

Downgrading so I need some advise or opinions on a good pair of high efficient speakers, 90 and higher db. Looking to pair it with a Primaluna Integrated amp.

Coincident Triumph. Single driver are all quite efficient.
WLM Diva Monitor (97db) are great with small tube amps and room-wise extremely flexible paired with the Diva Control unit.
Provided they are in your budget?
Some of Alan Yun's designs at Silverline Audio should be a great match. Auditions will be difficult to arrange, however.
Love my Triangle Cometes with my Primaluna PL2. You can find them used under $400.
Used Zu Audio Tone fit the requirements.

Later, as budget allows, you can pair them with a subwoofer.

I remember hearing these paired with a Zu Audio Method subwoofer during a Zu Audio Tour stop in Los Angeles, and thinking the sound was competitive with the original Definitions.
Devore Fidelity Gibbon 3XL (90db/8ohm nominal)
Second the Triangles. Hard to beat.
Second the Triangles. You could also explore some floor standers like Triangle Antal and Celius... 92 db sensitivity and easier to drive than the Cometes.
It'd probably result in more pertinent recommendations if you specified a
budget. The term "downgrading" has a vastly different meaning
depending on one's bank account.

BTW, you can pick up a used pair of Klipsch Forte II loudspeakers for around
$600, and these are full range (down to 32Hz), 99db. They are often available
in the midwest and can be found on Craigslist or EBay.

This is assuming you are changing to bookshelf speakers because you believe
this size is necessary to enable some cost savings. Not necessarily so.

What's the motivation for bookshelf speakers, lower cost or space savings?
Reference 3a or Coincident Triumph.90db + and a nice high impedance will serve the PL2 best.When taxed hard the PL@ can start to sound flustered,untaxed it is a sheer delight.
I have not yet heard the De capo's (reference 3A) but they are on my list. I saw a nice pair of Zu Audio Tones on here and gave it a thought. What kind of sound do they have? I heard the Zu Essence in town and was impressed but $$$$.
I love triumphs but sorry Celtic66, they are 2 way speakers. I'm looking at mine right now. Originally, Coincident had played with a concentric/coax single driver way before the triumph. I also have Conquests and Mini Triumphs. If you don't need much bass, the mini's are amazing. (my theater is coincident).

My second choice would be PSB stratus mini's.
I too have about 25 watts to play with. I sure am thinking about the Green Mountain EOS but not as a down grade especially from a Yamaha ns10m (he he). Also the deCapo I are on my short list. I'm just not too intrested in an overnight success type company, but that's just me. You might just hit pay dirt.
Intresting hobby we have here. Spend lots, itt'l help the economy! Happy hunting!!!