I have a rebel XTi. I want to buy a new lens for my cruise this July. I would like to capture mostly my kids with the characters up close. I find the lens I have does well if Im REALLy close to the kids but I know this is going to be a trip for them so I really want to be able to record them and their reactions to the trip, which they dont know about yet. I am up for any suggestions. I am even considering lens rental.com to try out something first.