I ended up using a gps universal mount for my car. It has been quite a few years, but I think this is the one I ended up with. I know I tried a few that were similar, but the one I went with had the spring-loaded arms. This doesn't sound very important, but I found out it is key when trying to remove the phone one-handed. I would recommend going to Radio Shack or somewhere similar and trying out a few different ones so there are no surprises.

http://www.amazon.com/GPS-GPS-715-Firm-Arm-Bracket/dp/B001VG83OM