(In relation to the wide angles, Elsinore has the Tokina and I have the Sigma, I’m sure Elsinore won’t mind if you hit her up for some example shots, and I’m more than happy to provide some if you want to see them in action.)
BTW, my ‘windows’ shot from this week was shot with the Tokina. The camera was located maybe 7-8′ away from the windows, the windows themselves are about 8′ wide. The shot was taken at a focal length of 12mm. I’ve uploaded the high res version to my flickr, you’re welcome to take a look.