I’m running some modified Dyna/VTA 70 amps with 7581A output tubes (a 6L6 variation) with speakers that are average sensitivity in a fairly large room. The amps run in triode mode nearly 100% of the time, which is only about 17 watts per channel....a flip of the switch to ultralinear mode would give me about 35wpc for another 3db, but I just don’t bother most of the time because I don't feel that I need it. Granted I don’t like to play loud too often, but power is rarely a problem.
If you get the urge to change speakers, and find that you don’t have enough volume, you can always change amps too.