I believe the 70-200 was mentioned earlier. I have upgraded a bit since I originally posted this. I ended up getting my 5D3 kit, and I'm going to be putting my T3i up on craigslist, and maybe even here, soon as well. I am torn between getting the 16-35 or the 100-400 next though. Lately I've been doing a lot of wide and low light stuff, experimenting with long exposures and all kinds of stuff. I've been kind if forced into it by not having anything longer than 105, but I have been greatly enjoying it.