I firmly believe that the only people who can truly navigate Shinjuku station, are people who work there and people who live there. Seems like no matter what, Google maps/Yahoo will tell you exit via b14 and every exit sign will helpfully guide you to North East, East, and all the exits a1 through a10.

It's always easier to exit the station and then figure out your final destination, which can still be annoyingly hard.