The Quicksilver Integrated tube amplifier keeps me happy. Its rated 20 watts are plenty for Focal Aria 906s which are rated at 89.5 dB. Currently $2500. Designer-builder Mike Sanders chose eight 6BQ5 and two 12DW7. I think one reason for so many tubes is that each tube does not bear much stress.
http://quicksilveraudio.com/products/integrated-amplifier/