Since you mention wildlife, I would take a long hard look at the 100-400 L, 70-300 L and 400 f/5.6. I own the 100-400L and it has been great for wildlife first on my 7D and now on my 5DIII. On a crop sensor, I honestly didn't shoot 100-200 mm very often. I can see it's use on FF for portraits, etc. But you mention telephoto and wildlife and that would push me to recommend one of the three lenses mentioned in the first line. BTW, if you ever are so inclined, I loved the EFS 15-85 on my 7D. Great general purpose lens.