If you have problems with vibrations, buy a combination of garmin zumo 660, touratech vibration dampened holder and ram-mount attachment of your choice. This unlikely combination for a car (originally for motorcycles) would work just as well in a car, but takes a lot of abuse. I can list the part numbers you would need from each vendor.
Pictures of my system is on the way after I get moved into my new apartment, I use my iPad with the tomtom app now, as I just sold the motorbike with the zumo...
