I got something from this company very similar to this (although my mounting arm is straight instead of wavy like this one.) I love it, and its worked for all mobile phones, mp3 players and GPS units I have ever used with it. Highly recommended and well worth the $25. In the 4 years or so since i bought it, i've never even had to remount the suction cup!
http://www.bracketron.com/products/m...ield-mount-kit