Front sprockets are pretty cheap and easy to change. Try it for yourself and see how you like it. My 07 came with an 18 tooth and I went to a 19. Most of my riding is is on country roads between 50 and 75 mph. (pretty much zero city driving) I was tired of trying to go for the elusive (non-existent) 6th gear so the 19 tooth worked fine for me. I do have to drop a few gears for passing but no big deal.
Unless fully loaded with gear and a pillion, no noticeable difference off the line (to me). I guess if you do a lot of city driving and want to go from light to light in the shortest amount of time, the 16 is the way to go.
I'll stick to my 19...
