I had a similar question recently after getting fed up with my suction mount one either dropping off the screen or blocking visibility.
In the end I used a Ram Mount motorcycle handlebar mount, and drilled and tapped a hole in the lower dash (it comes with a standard M8 bolt that runs through the middle of the ball). Bit of an extreme option maybe but I don't think it looks too bad, and has the advantage that anything can be mounted on the point now and it's completely rock solid. Has the phone well out of the way of the screen but still the right height for controlling stereo and glancing at for navigation. The way the Ram arms work means it can be adjusted however you want.
http://www.rammount....part/RAM-B-367U

