Sell:
Canon 10D
Canon 28-135 f/3.5-5.6
Canon 80-200 f/2.8L
Canon 300 f/4L

This should just about finance the first purchase:

Buy:
Canon 5D Bundle with 24-105 f/4L IS
Canon 100-400 f/3.5-5.6L IS

That would make my bag look like this:
Canon Rebel XT
Canon 5D
Canon 35 f/2
Canon 50 f/1.8
Tokina 12-24 f/4, this one probably will also go in the sale column depending how the 17-40 looks on the 5D
Canon 17-40 f/4L
Canon 24-105 f/4L IS
Canon 100-400 f/3.5-5.6L IS