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Is there something specific you're not happy about with the 18-55 IS? I started with the 18-55 non-IS (it's a dog a lens) and have many, many great photos taken with it.
The 24-105 is the standard walk around lens on my full-frame Canon when I don't have a specific need for something else. 24 mm on crop is a somewhat tight field of view though.
The Canon 17-55 f/2.8 IS is pricey but would be my #1 pick for a general-purpose lens on a crop camera. It's optically as good as the 24-70L/24-105L when I've used it, but the build quality isn't as nice as with the L lenses.
In the mean time, I'd definitely recommend adding a 50 mm f/1.8 to your collection - they're a cheap but great way of experiencing wide apertures and shooting under low light conditions.
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