Try a s/h Sigma 24-70mm f2.8. If you're thinking of something wider, try the earlier Sigma 17-35mm. Both are very capable lenses, and both usually can be had for less than £200 secondhand. Don't be tempted by the cheaper 19-35mm which come with badged names like Cosina, Vivitar, Voigtlander, Makinon, Falcon, and more, they are very soft, not a particular stunning optic, with dreadful focus motors too....I've seen these from £200 down to £50 in the secondhand market. I wouldn't touch one even at the later price.
Both of my suggested Sigma lenses will work fine on your 10D, and both are 'full frame' type lenses, so will work on an older AF mount film Eos bodies, as well as full frame Eos digi bodies.
hope this helps
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primarily using Nikon film and digi kit, and some micro 4/3rds gear for experimenting with old lenses
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