I'm looking for a dedicated in-car nav system. I've been using my PDA, and while I like the software (and the VGA screen) it's no longer supported by the vendor (4 years old, no map updates provided for the last two after 1 per year previously).
I'm looking at the high-end units because I want the screen size they offer and I like the Bluetooth connectivity so that they can be used as a speakerphone with my cell phone. This also makes the FM transmitter functionality useful, as getting old has reduced my hearing acuity and using the stereo speakers in the truck tp get better sound at highway speeds is very appealing. Features like MP3 players and picture viewers are basically useless, but they seem to come with the territory. Real-time traffic data seems moderately useful in the area I live most of the time, so I would consider that a plus.
I bought my fiance a Garmin StreetPilot about a year ago, and while the unit isn't bad it's too small when mounted at the distance it would be on my truck windshield, hence my requirement for a larger screen.
Current leading candidate is the Garmin nuvi; either the 660, which can be had for $600 at Sam's Club, or their current top-of-the-line 680, which is on sale at Dell right now for $711.
Anyone with experience with the high-end units care to chime in?