This is the one I have:
Amazon.com: Bracketron PHW-203-BL Mount, Mobile Grip-It Windshield: Sports & Outdoors
It works best if you have your phone in a case, but also works well without one. It will just hit the buttons sometimes w/o a case. My brother and girlfriend also have the same one and they both like it as well.
FYI: I found it at TJ Maxx for $12.99