speakers for low listening levels/tube amp


I just bought a tube amp (a sophia baby) and am looking for speakers that match well. I listen to lots of acoustic music, some jazz and bossa nova and occasionally some heavier music like rush/pink floyd etc. Huge bass is not a big deal for me.

I'm most interested in speakers that sound rich and detailed at low volumes. Having 2 small children and living in a townhome, I listen a lot late at night and want a good soundstage without lots of volume.

I've considered Omega and the Cain abbys (the Cains look great but are a bit spendy for me). I also looked at Klipsch (RB35 and RB75). I'd like to spend in the range of $600, but could go higher. Of course lower is better and leaves more money for music.

Does anyone have any advice? Never having heard these and not having time to demo, I'll be buying blind so to speak.

Thanks!
kunja
Kunja,
Per Ckorody recommendations regarding speaker efficiency, this website http://www.commonsenseaudio.com/nirvana.html might be of interest to you.
I would also suggest used Triangle Titus 202, which work well with low power tube amps and can be found for about $350 used.
I second Songwriter on the Europa...extremly efficient and sounds just as good at low levels but still can rock when need be. Good Luck
Wow, thanks to everyone for the tips and suggestions! You've given me a lot to look at.
Jalapeno, the Sophia Baby uses 6P1T tubes not EL34 tubes and has only 10 W of output power. While this might be just enough to drive the Triangle or Europa, a little more overhead might be desirable. I heard the GMA Callisto (slightly more efficient than the GMA Europa) on 18 SET Watt and was quite impressed though.

Good luck!