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For a crop, the most recommended ultra-wides I've come across are Tokina 11-16 f/2.8 (yes, f/2.8), Canon 10-22, and Sigma 10-20 (there's actually 2 of these, a f/3.5 and a f/4-f/5.6). I suspect the 8-16 you mentioned is the Sigma. It's pretty new so not sure how it goes.
The Tokina 11-16 is very popular and I believe there could be availability issues. Comes very highly regarded. I could never understand why the f/2.8 is a real selling point with this focal range. You'd mostly be shooting landscapes with it, in which case f/16 or so? Of if indoors, the thing is so wide that camera shake has less impact than standard lenses at slower shutter speeds anyway.
I had the Canon 10-22 as you know. I was very happy with it and only reason I still don't have it is that I've gone to a FF sensor 5DII.
The Sigma 10-20s are very highly regarded also, and are much cheaper than the Canon.
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