I think in the future I will buy a Canon 40D or 5D. I'm not sure yet, it depends on if I want to fork over the extra $$$ for the 5D. It will be awhile yet, and right now I have a EOS Digi Rebel, and in the meantime, I want to get a different lens than the 18-55 mm kit lens. I saw that Tamron lenses are a fraction of the price of Canon lenses. Are they worth it or will I just be disappointed that I got a big fancy looking lens but only average image quality?