Best car mount for Incredible w/Seidio 3500? I see iGrip & Arkon mounts - dash & cupholder -with & w/o USB &/or FM transmitter. Has anybody really liked any of these (or others ) for thir Incredible with the extended back that comes with the Seidio 3500 mah? Please point me in the right direction if this has been answered before. Thanx!