The user has more affect on the editing of raw than the software. iphoto is going to be more user friendly than DPP, but also limited.
For the long run, I'd get Aperture or Lightroom, DXO is also good, and there are others equally good. The advantage of raw is in the wide range of editing tools available, so after spending that much on a camera, get a good editing tool. Aperture should be great for a Mac user.