Traded the 16-35mm f/2.8L for a 24-105mm f/4L, a 10-22mm f/3.5-4.5, and $550 cash.
I loved the 16-35, but the low range won't do any justice when it's my main [workhorse] lens (I'm going to Europe and I'm only allowed to take 1 lens + the 40mm pancake). The 24-105 should do better, the f/4 may be a bit high, but for me, its a better deal. The 10-22 also should complement my APS-C on the 70D better. And cash is cash, lol.