I am a stop-motion guy. 50D + 70-200 II is well suited to that. I am headed to Alaska in one week, and I want to branch out and get some landscape shots, as well as some closer in shots of us on a boat catching fish. I am looking for inputs on reasonable lenses in a wide angle format for this. I am considering the ubiquitous 24-105 4L, the 17-40L, and the ASPC oriented 17-55 2.8. Opinions? I have information overload on the reviews, so would like to get some real-world inputs from the forum....thanks in advance. should I even think about other manufacturers? Obviously, the less I spend, the better.