I am considering buying a used Dell Streak (Mini 5), buying the vehicle mount, adding ALK CoPilot navigation onto a micro SD, and using this as a vehicle GPS. Can anybody here tell me if that would make a good vehicle GPS? Also, I would probably get it carrier subsidy unlocked and install a T-Mobile prepaid SIM card as a backup. Plus, the T-Mobile SIM card should allow access to a few websites. I also figure with wifi I can remove this from the vehicle mount and have a tablet with me while traveling. Anyway, would this work well or are there some shortcomings by doing this?