Im looking to pick up a Canon 20D or 30D with one of the upgraded kit lenses that come with them. Just to kinda get started. The two kit lenses that are showing up in the aftermerket scene are the Canon 28-135 and the 17-85. Ive read the reviews and they both have their ups and downs. Im mainly interested in shooting landscapes, low light stuff and some portrait. Which of these lenses would better suit my needs?