So for Christmas I got a Canon Digital Rebel Xti with the kit lens. I am going to London (for a semester) and of course I will be taking it with me. I don't have a zoom telephoto to go with it and I am curious what your suggestions might be. Right now my budget for a lens is around $200, but after London it should be more since I will be working again. I can probably afford around $500 once I get back, so the big question is so I wait and get something betterr? or get something now to tide me over? I would probably be using the zoom lens for shooting sports and some wildlife, most likely football and basketball. Any advice would be appreciated!