I own a Canon 20D w/ 1 lens (Canon 18-55) and a Canon 580 EX speedlight. I wanted a new lens for my birthday and after much research, decided on the Tamron 18-250mm F/3.5-6.3 AF Di-II LD Aspherical (IF) Macro. My husband went to Wolf Camera to buy the lens and they sold him a "better" and more expensive Quantaray 18-200 mm OS DI 3.5-6.3. I have until Friday to return the Quantaray if I want. I've been doing more research on lenses over the last few days than I ever have and I'm more lost than ever before! Which of these lenses is better or am I totally off the mark and there's another lens I need to be looking at?