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My opinion is that the 500mm is the best compromise of weight and focal length. If you're just going to shoot wildlife, then maybe consider the 600mm, but in most cases for me, 500 is just fine...the 600mm is very heavy....BIF's will be much more difficult compared to the 400mm f5.6 even with the Wimberly. Since I like going to the Abbotsford Airshow, I found that the 500mm was almost too long even on a full frame 1Ds mkIII. I would have preferred a 400mm there.
You have to consider your support system too. The 600mm is going to require a heavy duty tripod & head, so be prepared to spend $1000+. No cheaping out on a Benro or Giottos!
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2007 Volvo V50
Taken by ex: 2005 Toyota Prius.
R.I.P. 1997 Lexus ES300. 
R.I.P. 1989 Acura Legend Coupe LS.
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