I'd be tempted to look at the 7D and 15-85, given that Nikon has just announced the D7000, I expect that Canon won't be able to resist dropping prices to compete and the fact that the dollar is up.
I think there's too much emphasis given to high end glass, I had an 18-200 Canon lens and a Sigma 17-70 before getting my L series stuff, both were decent lenses and not that expensive.