I have another decision making problem..I have my camera all picked out(D70s for those that want to know). But now it is time to choose a telephoto lens. I have thought of 2 choices so far that seem reasonable for my budget. The Sigma APO 70-200mm F2.8 II EX DG MACRO HSM or the Nikon 80-200 F/2.8. Are the both comparable in quality? Also i will alway take suggestions from all of you as well.