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If you're intending on going full frame in the near future the 17-40 F4L would be nice.
Reviewers claim it still has some barrel distortion at the wide end but is easily corrected in software (the 50D software bundle has correction for many lenses).
If you're staying with the 50D for a while I'd look at the 12-24 Tokina, a very nice lens for not a lot of money. When and if you go full frame you will not lose much on resale.
One thing you will miss if you go full frame, is the reach of your telephoto lenses; the 1.6 crop factor of the 50D makes your 70-200 reach a whole lot further.
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