I'm planning to buy an all-purpose lens for my canon SRL (EOS 20D). Which lens would you recomend to be better? Canon EF 28-200mm f/3.5-5.6 USM Standard Zoom Lens for Canon SLR Cameras (without image stabilizer, more range) or Canon EF 28-135mm f/3.5-5.6 IS USM Standard Zoom Lens for Canon SLR Cameras (with image stabilizer, less range) thanks !