I have to say that I find my 24-70L my most used lens on my 30D. That's followed by the 70-200L. I make very little use of my 16-35L, because I just seem to think in longer rather than shorter focal lengths when visualising shots.
So if had been me asking the same question, then the advise to stick with the 24-70 and 70-200 would be exactly right. But we are all different which makes offering any suggestions to others very difficult.