I am seriously considering buying this lens [ame=http://www.amazon.com/gp/offer-listing/B001044RIQ/ref=dp_olp_used?ie=UTF8&qid=1276703301&sr=8-2&condition=used]Amazon.com: Used and New: Sigma 70-200mm f/2.8 DG HSM II Macro Zoom Lens for Nikon Digital SLR Cameras[/ame] since it is much cheaper than a Nikkor and I am on a limited budget. It looks really sweet but I wanted to see if any one in here has one and has any complaints about it? I am looking to use it mostly for sports shots. Example shots would be great too!!