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I use an EF 17-40 f4 L series lens. It’s the cheapest L series lens you can buy, it’s very light, but it’s optically brilliant.
I use mine on an EOS 50D, so it will go on your 450 comfortably. The thing with the L is it is has a minimum aperture of f4 all the way through the focal range so you don’t lose the light capability normally associated with zoom lenses.
Price wise, I think it’s cheaper than the 15-85 mentioned above. If you want to stick with ef-s look at the 17-55 f2.8, another awesome lens, but no longer available new, so it’ll be ebay for that.
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