Well, in your situation, here's what I think.


You've got a good walk around lens with the 28-135. You've got a camera with 18 MP, so croping in, is something you can easily do. (I know we all want to crop with the lens, and save all the juicy MP but still) Unless you plan on taking pictures of individual things from a long distance, like a bird on the other mountain, I don't think you're going to need anything too long, and even then, 200mm isn't much of a climb from 135, so you'd either have to get a cheap 300, with worse picture quality, or an expensive 300, which is expensive....hah


If you're in the city, you'll NEVER get cool shots, like you'll get from the 10-22. I've got one (currently on the disabled list thanks to me using a friends tripod and just goofing and it going to the ground) and it just takes amazing city shots. It handles distortion extremely well, and is sharp. When you are at the base of a building, or any other structure, and you tilt the camera up, it just makes everything look like it's towering over you!


Plus, since you can't get very far away from things in the city, the wide angle will allow you to capture more of the scene. Another cool thing about the 10-22, is that if you decide to get brave, and get close to your subject, the results are thrilling! It's not a macro lens. It has NO magnification qualities, but it has a low MFD and the way it exaggerates distances can simply make a picture.


Last but not least,it's a great landscape lens. Due to the 10mm wide end, there's a boat load of depth of field wide open, let alone stoping down. You'll never have to worry about a certain part of the picture being blurry. Want to get a huge cut of that mountain range? Done. The entire city from a short ways away? No problem.


The only thing you want to look out for is portraits with the lens. It makes people look distorted, especially at the widest angles, and on the corners. If you keep zoomed in to 22, it's not so bad. Though, animals are a great subject. Get close to your dog, tounge hanging out, and it just makes for a picture thing brings a smile to your face! You'll get ZERO background blur with this baby, though. It's just not made for that.


So, obviously I'm thinking I'd go 10-22 here. When I got mine, I was blown away with what can be done with the lens. Maybe other than a great macro lens, I don't think there's a more "fun" lens to use out there.