I just swapped out from my 5Dc to a 5D2 two weeks ago. I checked everywhere for the best possible price, and wound up buying from eBay from PMI who have 100% feedback after 6 years on eBay, and I've even seen some threads on here relating to others having great luck with them. Here's a link to the body:
http://cgi.ebay.com …meras&hash=item230395236c
eBay had sent me a $100 off coupon at the same time I happened to have the money to make the jump, so I ended up with a great deal, and the camera has been perfect. Was boxed and new as stated, USA warranty, etc. They are an authorized Canon re-seller by the way.
Sorry if I sound like I'm advertising from them, it's just that it was such a great deal that I'm still as happy as can be lol.
I've heard this before, and I go by this rule personally also...if you're always waiting for the next best thing, then you will never purchase anything. Stuff like this is upgraded all the time so if you want and can afford it now, get it. There's no reason that you can't sell it later and get most of your money back in the event the 5D3 has some killer feature you absolutely must have. Personally, I don't see myself needing anything more for a while other than perhaps a second body as a backup should that need arise.
As far as auto focus and frame rate...hogwash. It's not a sports camera and it's not advertised as such, however, I've shot in some horrible low light with little problems locking on. The room on one shoot had only very dim ambient, and while it did hunt a few times it locked on very consistently...and again, given the light present that impressed me more than I'm able to convey here.
Frame rate is a non-issue for me personally as I don't shoot nor have a need to shoot burst, but it could be for others. Even when I've shot action. While it may be the key for some professional sports photographers covering a big game who absolutely have to have the most critical moment, for something like local marathons, birds in flight, skateboarding, etc...I've had zero issues with my 5Dc and since the 5D2 is basically the same in that regard, I don't foresee any issues there either.
I did birds in flight and on the water two weekends ago (http://www.flickr.com …h/sets/72157626203393872/
) as my first outing with the 5D2 to test it out and it handled great. It's not a 1D3, 1D4, or a 7D, but it's not the slouch people seem to convey it is..or at least I'm not seeing it first hand.
Sorry if I seemed to go off on a tangent, just trying to make a point that I think you'll be happy with the 5D2.