Bookshelf speakers for small room

I have a small room and listen rather closely.  I'm using a Uniti Atom and some older Martin Logan 4s and looking to upgrade the whole system with a great turntable, tube amp and a different DAC.  A local dealer demo'd me on the Harbeth P3 XD's and the vocals came through with crystal clarity- loved the sound!  But he played it loud and I'm playing at very low volumes (kids, wife, small house).  

What are some good bookshelf options for a small room and streamed music (and vinyl) played at lower volumes?   A good tube amp/DAC to match??
You can’t go wrong with Fritz. 
I wanted to bring a few things to your attention:
If using close to the wall do sealed or front ported. Add a sub to get the rest of the bass and bloom you want. Also, you can listen at really low volumes because the sub has its own amp which means you can keep the volume low 55db or less and still get the full range of sound. Are you pulling them out into the room. If so then you can go with a rear ported speaker. You should still get the sub for low level listening. You have to match your speaker to the amp. A lot of good bookshelve speakers are 4 ohm. You need an amp that can drive it properly on my second system I have a really nice 100w amp pushing an insignia bookshelf speaker. It sounds amazing. With a 200w it sounds even better at low volume. Be careful, some of these 200w integrated amps don’t really get out a full sound till they get too loud. ML Is one. Ayre  is awesome at all volume levels. Don’t be fooled by a 70wpc Ayre int. Amp. It’s like having 150w of power. 
+1 on Omega recommendation for low volume, intimate listening to jazz and acoustic music.  I've owned both Harbeth and Omega, and Omega excelled in this application.  

@ZM- Which Omegas?
@HShifi- Thanks, good info.  which Martins do you have??
@labelman - the Super Alnico Monitor is probably the ideal model for your situation.  The proprietary Alnico driver Omega has developed is something special - super quick, extremely rich tonally, detailed without being fatiguing, very "lifelike".

Louis at Omega is a great guy to work with and would be happy to talk to you about your situation and either recommend something from the product line or do something custom for you.