Here is some info on the Magellan Roadmate 1700:
Auto starts/shutdown with ignition
Updated via mini usb to usb to latest firmware (Thanks Tko512iFX)
It can be hacked to run Mio (I'll leave mine alone)
The touchscreen has been really accurate
Sound is loud enough from the Magellan in the dash (not using AUX)
It's purtay!!! A lot better than the orange screen
People using iSimple, newest firmware is out that gives better support for OS 3.0. Had pausing/skipping issues, but it's been fixed =D.