On my way to California, my Garmin Nuvi 760 died on me today. It's four years old, so maybe it's planne obsolesence. I can turn it on, and it will give me my next turn, and then it dies, most of the time in midsentence. Unless it's plugged in, it dies almost immediately on battery power. I have a chance to shop tomorrow, so what are your recommendations for a new model?