Canon 6D or 7D for indoor sports (volleyball)

I'm not sure about this one.  The 6D has MUCH better low-light performance than the 7D and everything I've read suggests its center AF point AF is very good and fast.  And I suspect reach isn't as critical for your situation as for some other situations.  4.5 fps isn't that bad, either.  And it's a much better landscape and portrait camera than the 7D. I own a 7D, but I dunno....

FF