Stock gearing is 14/50 on U.S. models.
First is very low and a lot of people who use them primarily on the street regear them. I suggest you rack up a boatload of miles under all conditions before making any decision to go taller.
Takes some getting used to at first, but these things can handle a zillion rpm all day, every day. It's normal for them to sound like they're ready to hand grenade.
Not much power there, and if you want an all-rounder you can't go wrong with the stock combo.