I'd love a 200mm with IS for outdoor portraits and candids, but the Canon f/2L is out of my price range (and huge). Are there any non-Canon options at f/2.8 or faster that compare favorably with L-glass? I may consider getting the 70-200 L 2.8 IS II soon, but its size, and the overlap with my 70-300L make it an imperfect solution. Any rumors of a future Canon 200 f2.8 prime with IS?