+1
Current is the game, absolutely. But I would not start trying to find the minimum because as you already found the bass starts dropping off. Maybe in a quick listen that is ok… but it may not sounds as good at quieter levels. I would not go below 100 wpc and with solid state, more (of the same quality) generaly sounds better. Tubes are way different… much more flexible and not requiring as much power to sound good.
Brand is a personal preference. To me solid stat Luxman has accentuated treble and a bit extra bass and is attenuated in the midrange so is not that musical. It sound very “high end” and sparkly… and looks pretty. I would look at Pass, better balanced tonally, with good midrange and very musical for solid state. Ultimately your preference.