Unless you are planning on using easy to drive high efficiency speakers, which many like, I would not want to limit myself to a low watt amplifier. If going the Black Ice route, I would opt for the F22 integrated at 50-60 watts per channel, only because the first two integrateds in their line are 10 and 18.5 watts.
Even my Dynaco ST-70 is 35 watts per channel.
Not to mention the Dynaco is the highest selling tube amp ever made (sorry, couldn’t resist).