@stuartk 50 wpc should be plenty of power for a 91 db speaker, assuming that the room is not unusually large and/or listening levels unusually loud.
Maybe what you are missing is a little bass? Maybe adding a subwoofer to the mix?
Otherwise I think your system seems fairly well balanced. Sure, you could get better speakers, then that usually drives you to get better sources, amps, cables, etc. The merry-go-round never ends for some.
If you are relatively happy, just enjoy the tunes and spend the money elsewhere.
Maybe what you are missing is a little bass? Maybe adding a subwoofer to the mix?
Otherwise I think your system seems fairly well balanced. Sure, you could get better speakers, then that usually drives you to get better sources, amps, cables, etc. The merry-go-round never ends for some.
If you are relatively happy, just enjoy the tunes and spend the money elsewhere.