Man I wish the Samsung Car Dock had an option for vent mount! I just bought
Amazon.com: Arkon SM429-SBH Mega Grip Universal Holder - Removable Air Vent Mount: Electronics and yeah it holds the phone.. but also shifts a bit on bumps and isnt as nearly aesthetically pleasing as the OEM car dock. Thankfully it was only 14 bucks.. Ill use it until something better comes along.