I have a 40d and want a wide angle lens. I've had it in my mind that I want the 17-55, until I saw a 17-85 on Craig's List for a good price. It made me think, do I really need to dump a bunch of cash on a lens? I mean, would I notice a difference? The main use would be family/holiday, mostly inside stuff. But definitely used for landscape too. I've also been eying the 16-35L. And I've debated about Tamron's 17-50 2.8 and Sigma's equal. There's too many options. Someone tell me what to get. ps. I don't plan on upgrading to a full senor body any time soon/ever.