I'm in a similar predicament. I just bought the 5d Mark III and 24-70 2.8 II. (Arriving on Monday...damn UPS was supposed to deliver today but was late).
Anyways, I have a 60D and the 10-22mm... I love using it at 10mm. If I sell the 60D+grip and accessories, and the 10-22 on craigslist, I can probably get about $1500 and buy the 16-35 2.8 II.
My questions is:
Is it worth selling my current gear?
Do you guys think I should keep the 60D, not bother with the hassle of trying to sell gear, and have a backup body/2nd camera angle when I do video work.