I have been eye-balling a f/2.8 zoom. I had my mind set on a Nikon 80-200 AF-S, but used from KEH they were around $889.00 (BGN), and I checked with my local Wolf Camera frown and they had a NEW Sigma 70-200 f/2.8 EX HSM lens. That lens is built like a tank, and seems to be nearly silent when focusing, and quite fast. I purchased it, but haven't had much time to play with it to see if it is going to stay in my bag - or if I am going to get the Nikon AF-S (used). Anyone have any experience with both lenses? I hope I made the right decision - New Lens with warranty - vs. used discontinued lens with no warranty.