I'm a pro photographer, I am a member of the NUJ, and my recent work includes such variety as the New York Times, and Big Brother....
SERIOUSLY consider the Sigma 70-200 F2.8
Its 95% as good as the non IS Canon L and a huge amount less money.
I have kit that would be scoffed at by some amatuers I expect, as I run all sigma lenses, however the fact remains, I get paid for my stuff, so the kit can't be all bad, it IS about your skill, not about whos got the biggest whitest lens.