Banana or energy bar, that's a good combo. I do something similar, adds just enough energy without feeling too full. Fasted runs can be brutal, especially for us beginners.
I'm not convinced. If my phone can already track my routes and distances, I'm not sure I need a dedicated GPS watch. Accuracy is important, but how often do you really run in areas with poor phone signal? Convenience is nice, but it's not worth breaking the bank for me.
Not exactly running advice, but I guess it's somewhat related.