What size guitar would be best for me?

My thumb-to-pinky span is just over 6.5", my index finger from palm is 5.5". I am 5'1" and about 120lbs. I've been looking into Baby Taylor and Luna guitars (I tried a Baby Taylor out at Best Buy the other day, though it felt awkward still), but I'm unwilling to make a purchase until I'm more sure of what I need.