I 2nd on that Forever Black stuff...but it wears off quickly.
I have an 03 Sport as well, and the waxing (with TW Ice) and the Forever Black have really kept mine looking good.
Replacing all of the panels and bumpers is REALLY expensive, so i wouldnt go that route! Just one of the lower rocker panel protectors on the front doors is over $200! GEEEEEZ!