Just bought a D5100 with the kit 18-55 mm lens. Ordered a remote shutter release and a Nikon sb-400 speedlight. I am looking for a good prime lens for landscape and portrait shots. I am thinking about the Nikon AF-S 35 mm f1.8. Is this a good choice, or can anyone suggest better for a reasonable price, given that I don't want to spend a fortune until the lens buying bug becomes incurable?