I've been shooting soccer games on a weekly basis using a Nikon D300 and the Nikkor 70-300mm zoom but as my grandchildren move up to bigger fields the lens just doesn't cut it anymore --- 300mm is a little "short" of what's need + the fact that quality falls off past 250mm. My problem is the 80-400 mm Nikkor doesn't focus fast enough and the 200-400mm Nikkor is out of my comfort zone with respect to price I've been thinking of switching to the new Canon 7D and I'd like some comments on which Canon lens would be suitable -- I've handled the 100-400mm L lens and don't care for the way it handles and I'd like something "brighter". I've been thinking about the 70-200mm f2.8 IS with an extender but don't have any experience with extenders of any kind. Games can start early (8am) or late (4pm) which is't a problem in the summer but we play year-round in California and I'd like to stay around f4 if possible. Since I'd be starting a new system I'm open to any suggestions or combination of suggestions.