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I have tamron 17-50 non-vc and I would take it before any of the FF lenses listed here. FFs are not wide enough and they're much bigger. I think Canon 17-55 is too big and heavy and shabilly made for the money. Plus I believe (someone here pls correct if I'm wrong) it casts a shadow with a built-in flash at the widest setting. Tamron doesn't. It's small, sharp, focuses quickly (although louder) and it's less expensive. And comes with a hood!
If anything happened to my lens, the only one I think I would consider would the the sigma 17-50 OS.