I've heard not so good things about the build quality of the 10-22. Also, if you're looking for a walk around lens, the added range of the 17-40 will be more beneficial. 10-12mm is pretty much unusable unless you're going for an abstract shot (even with the 1.6x crop sensor).
My vote is for the 17-40L, it will have better resale value as well (marginally better, but still better none the less)
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