If the buttons really bother you, then swap them out for black fabric covered buttons-- the kind used on tuxedos. It will tone down the jacket, but still keep it formal enough for black tie events.

You will need to do the same for the five button waistcoat, but you can leave the shiny buttons on the three button waistcoat for evening wear, if you so desire.

Either way the black Argyll is still the best "one jacket" option.