It' time for an upgrade. I currently have a Canon Rebel Xsi with the standard 18-55mm lens, and the clarity just isn't cutting it... I would just really like my pictures to be sharper and clearer. Should I buy a new lens or a new body? I have a pretty large price range, because I've saved over 1,000 USD. Is the body more important than the lens or is the lens the most important part? Thanks!