I have a 3G iPad and am going on several trips in the near future. I want to get a turn by turn GPS iPad app, and I would like some opinions on the best option. The vast majority of my travel is in the Eastern US, so my options are Navigon for Eastern US at $30 (not optimized for iPad), TomTom at $40, or CoPilot HD for $30. What is your experience? Any help would be appreciated!