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A few things that may make a difference, depending on how/where you drive, I have gone from an old Garmin GPS 38 with no basemap, through using a GPSMAP III and an Ique 3600 as dash mounted, as well as using a full laptop on a mount in the pickup truck with a bluetooth/usb GPS. (and way to many gps systems on the boat)
Audible prompts are very helpful in reminding you to turn/exit, and announcing the street name is good in urban areas where you want to look at the road and traffic, not the screen.
Map updates, PC integration for route downloading is a good thing, but you will also want to see if you can use it one handed while shifting..
screen size that shows a decent image of the map allows you to figure out what street you want to turn right on in 100 yrds.
Some have the Bluetooth integration with your phone, and an audio output so that you can wire the prompts into your radio and have a suitable gateway such as the denison potentially mute the audio for the prompts/telephone.
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