I'd be inclined to take the Tokina 11-16, Sigma 17-50, and the 200/2.8L. I spent three weeks in China with considerably more gear (gripped 5DII, 16-35/2.8L II, 24-105/4L IS, 70-200/2.8L IS II, TS-E 24L II, 1.4xII TC, and a 430EX II). Of those, the 24-105L saw the most use, followed by the 70-200 II. The 16-35 wasn't used often, but those shots could not have been taken with the 24-105L, so I was glad had the ultrawide. I did not use the TC or the flash much at all.