I've been getting really good advice from you guys. Thanks for your time. My next question involves lens. I want a lens at 28-300mm. I read about the sigma lens and tamron. The tamron has an XR lens and now an XR Di lens. I know Di is for digital but is the difference in price between the two models worth it? Also, same queston about sigma. Which lens is better? Are they exactly the same or personal preference? Thanks again for your time.