I am an old house nut. I have been in many 100+ year old houses with heart pine floors. When I built my new house in 2005 I put down heart (yellow) pine.
Over time the floor develops a "patina" with the heartwood standing proud of the sapwood. I think it looks great. You will never make pine flat and shiny like maple or oak for very long.
I am not sure how well white pine would stand up.