I would go the 4.8 route for the cost difference without hesitation. With a 4.8 you will be at least a 04 and up which is facelifted with the new engine and a host of other improvements. You will get a more powerful engine that is more fuel efficient, newer audio components (aux in, sat ability, bluetooth (2005) and cd text), rear reclining seats, panoramic sunroof. If none of this matters than 4.6 is a good choice but from my experience with both cars the 4.6 is pretty bad gas milage wise and the 4.8 is pretty decent.