So after the overwhelming majority voted that I go ultrawide with my next purchase (thaks for the replies by the way) my next question is which. Ideally I will go for the Canon 10-22 provided i can afford it. But I'd still like to consider other options. I've been strongly cautioned to avoid Sigma, and by Sean to avoid Tokina. My question is if anyone has experience with this Tamron, it fits best in my price range without waiting til the middle of next year. I used it briefly in the store today, has good build quality, accurate, fast and silent focus, but its difficult to do a good evaluation of IQ. Thanks in advance!