I would not recommend a 'G' lens at this point (assuming it has been supplanted by an equivalent E or P lens, which this one has not), mainly because it's a "legacy" lens-type, meaning it isn't necessarily going to be supported on newer cameras and probably is optically inferior to the newer version. All the G refers to is the fact that it has electronic aperture control, which is generally what you want. Pretty much all of Nikon's last generation lenses, including all of the pro lenses from that era, are G. D just means that the lens reports distance information to the body; it does not signify pro/consumer so much as it signifies a lens that's two generations back (that is, one generation older than G lenses). For example, I have the 50/1.8 AF-D prime and it's clearly intended for consumers. At the end of the day, this is Nikon's only "nifty-fifty"-type lens for DX users, so if someone wants this sort of lens, they don't exactly have a lot of choices (30/1.4 sigma is the other option).