[cycomachead]

For me it's Garmin. Mainly because I already had a set of their maps for my GPS and I like the maps. I think it has TTS but I can't verify it. It can get live traffic and street cam updates though I'm not sure if it's free. There app itself is free and works well. However detailed maps do cost money but they're good maps.

My other check was for Google because it's simple and easy and has a satellite view. However that requires internet which I don't have except for WiFi. Also the point about being stuck in the middle of no where w/o and evdo is a good one to consider!