I am looking at purchasing either Canon XTi or 40D and am trying to figure out the total price I would be paying. I am just wondering what extras I will need to buy. Do you suggest an extra battery? Will one lens (28-135mm, stabilized) be enough? What else would you suggest? I just don't want to start buying a camera that I can't afford to buy all I need for it. Any suggestions will be welcomed. Thank you.