I am in the process of going from an UW point & shoot camera to a Nikon D80. It would appear from the various posts that there is a wide array of lenses out there to choose from depending on what you're trying to do. Well, I'm just getting started here and am looking to take my point & shoot experience to the next level, get some experience, and then perhaps learn how to use specific lenses for specific purposes. Does that make sense? Anyway, what lens would be a good choice for getting this process started? Thanks.