Least offensive for hands and ears, definitely get a Rupes, they're a different league compared to my vertool/das6 equivalent polishers.
Budget option? Have a look at a vertool das21e, 5 and 6 inch backing plate on a 21mm throw machine. Would be a good combo with the Porter cable if that takes a smaller backing plate with small pads for tighter areas?
The Vertool feels like a cement mixer compared to a Rupes machine though.