I just got a new D700 for Christmas (I have been shooting with a D200 for a few years). I'm hoping to add a new lens to my arsenal to take advantage of the full-frame capability of the D700. Here is what I have currently: AF 17-55mm f/2.8 DX lens AF 50 mm f/1.4 AF 85 mm f/1.8 AF 70-200 mm f/2.8 VR I do mostly photography of children and families with available light. I'm frequently shooting indoors under pretty low-light conditions so I'm loving the great high ISO performance of the D700. I have loved the 17-55 mm f/2.8 DX lens on the D200, but want a lens that takes advantage of the full-frame sensor on the D700. I'm using the 50 mm f/1.4 as my workhorse right now, but want something for a little wider angle work. Sometimes I'm shooting in a tight living room and can't get wide enough with the 50 mm. Is there a good zoom comparable to the 17-55 f/2.8 that isn't DX-format? Or a wide-angle prime that people love? I'm looking for best bang for the buck here and hoping to stay around $500, so a new zoom is probably out of the question unless I want to sell my 17-55.