All good advice above. I'll add one thing. You mentioned videography is your main interested. If that's the case, I would definitely go with the 24-105. The IS is amazing especially with video. It's like you have a glide cam with you all the time. Night time video will not be bad at all. Typically in video, you do not want to have too thin of DOF. The awesome sensor in the 7D will make up for that loss in aperture step. I have a 5D mk2, 16-35, 24-70, 24-105 and other L lenses.
For video: my use of lenses break down like this:
- 50% - 24-105L (switch from wide to tight immediately, great docu lense, mostly hand-held)
- 40% -16-35L (I shoot a lot of WA, my style)
- 10% - 100 f2.8 L IS (for macro and portrait; suuuuuper sharp)
Here are examples of my use of these three lenses
Head Piece commercial
CrossFit Supplement commercial
Last edited by Trijicon; 04-26-2012 at 12:00 PM.