I currently own a 60 CSx which I have used for my auto travel. I have found it to be great for outdoors but not so good for auto use. I travel about 10 times a year, so it gets use in my rental cars.
60 CSx Drawbacks:
Small Screen - Harder to see, must take attention off road.
No voice - In metro areas with lots of freeways/intersections, I find myself looking at it frequently because of all the beeps.
Buttons only - A touchscreen is easier for interfacing with the device. This is mostly an issue when auto routing.
Auto units I am considering:
Nuvi 660 or 650 - Is the Bluetooth in this any good? That is the only advantage of the 660 and I already have an ok hands free speaker. Expensive and just a wider screen than most others.
Streetpilot 7200 - No Sirf III, which kills the deal but I love the huge screen.
TomTom GO 720 - Uses non Garmin software so possibly more $$$ to update all my devices.
I am partial to Garmin as I already use the software. Can I download trips from my PC on any of these units?
I do not need FM transmitters.
I do want voice with text to speach.
Bigger the screen the better.
I do not want to go back to pre Sirf II chips.
Any suggestions of other units?