Ok, I'm going on a cruise Jan 2nd to the Caribbean. The wife is getting me a Canon XS kit for christmas. The kit lens obviously is not the best lens for scenic shots I will be taking so i need to get a nice zoom lens. I know this is a very opinionated question but what should I look for? I would like to buy a used one if any of you have something for sale. 55-250? 70-200/300? 75-300? Help! I need it to be relatively cheap due to just buying the camera and being christmas time.