You might do better to wait until the new Nkon 500/4 VR is available. Yes, it's disgracefully overpriced but when you consider the cost of swapping systems you might come out about even. (And if Nikon didn't plan it exactly that way when they set the whopping price, then I'll eat my boots.)
But if you go Canon, then I suspect that you will find the 24-105 (or just about any of the alternatives mentioned) too long at the wide end. I have 24-105 and I have to confess that I don't really like it. It's a great lens, but not really suited to a crop camera. On a 5D it would be a different story.
That leaves you with the lack-lustre 17-85 (not especially cheap, bad barrel distortion), the very expensive but superb 17-55 (might be too short for you though), or (maybe this is your best option) the Sigma 17-70. I haven't tried a 17-70 for myself but they are well regarded and quite reasonably priced. I'm a bit tempted to get one myself for those times when I don't want to lug both the 24-105 and the 10-22 around and swap lenses constantly.
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