I am taking a trip to Amsterdam this weekend. I would prefer to take one, maybe two, lenses with me. I need something that is going to be versitile. Not only will I be taking pictures around the city but I also plan on taking pictures of the flowers at the gardens since it's tulip time in the Netherlands. This is going to be my first time taking travel pictures with my SLR so I thought I would ask for the wisdom of the group. These are the lenses that I have: 50mm 1.8 18-55mm 28-90mm 75-300mm I am also planning a trip to Italy this summer and want to buy a better lens for travel photography since I will be doing a lot of traveling around Europe over the next year. What would your suggestion be for the best lens to get? My pricing is flexible but I want the best lens at the best value. I would prefer to stay around the $500 range if at all possible. I have a Canon XTi. TIA for you suggestion.