I have been using the D70 for about a year now and love it! The lenses I have been using are Sigma lenses that came with the camera as a kit and Nikon lenses that came with with an N80 kit. All four of the lenses have been okay...but I am wanting to upgrade to a good, high quality lens primarily for portrait work. Most portraits will be close up head shots, glamour style photos and a few outdoor photos. My price range is $500 or less and I am not looking for a specific brand...just a good, crisp and fast lens. Any suggestions from those of you that are using the D70? Thank you in advance.