Make sure they do any/all software updates to it. It will save you some time. I think dealers are supposed to scan, but you never know unless you ask.
For GPS, it really depends on what you want to do with it. For a movable GPS, I have the Garmin 2720 and could not be happier... Price was great ($550), maps are spot on, loaded with +6 million POI's, has good features and is easy to use in ANY vehicle.
Oh yeah, the reason I came to post... PICS ARE REQUIRED!!
07 Wrangler Unlimted Sahara 4dr 4x4
05 Liberty CRD 4x4 (gone!!! 3/23/07) - When Jeep gives you lemons....