Definitely, get the PC and have it custom mapped. I gained over 8HP and 4ft/lbs going from the map that was supposedly designed for my setup to the custom map. If you goto powercommander.com they list all of the places that are "certified" to do it in your area. It is worth going to someone who has been to the Dynojet training!
BTW - Do you need the "r" for the '02? I am pretty sure you do for the 03, but I dunno about the 02. I think the "r" adds ignition stuff that you won't need unless you big bore or run nitrous... For us stock motor, normally aspirated guys, I don't think the "r" is necessary... Check into it.