Well I'm in the market next week to up grade my 5D and i'm certainly going to look seriously at the D3 nikon even if it means changing every piece of Canon ive got, a hard wrench I know as Ihave used them for 30 odd years, its going to take some hard sell and convince me either way.
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Not sure I would categorize that as an "upgrade". Sure the D3 is a great camera, but that's more of a sidewise move. (yeah, I know, some won't agree with that. But it's hard to argue the D3 is that much superior to the 5d).
If you really want an upgrade you might want to wait. It's a photokina year, and it may be the D3 is just the first step in Nikon's admission that full frame sensors are here to stay. By September you may have a better 5d, and new higher resolution Nikon available.
I personally never have more than 1 card in my Camera at a time anyway. Don't want to mix them up, or worry about telling the camera which card to use. I hardly ever shoot with large cards, I'd prefer changing them a little more often, knowing that if one card bites the dust, it doesn't have 2 hours of shooting on it. I also rarely let a card fill up before changing it ... why wait. I'll change it when it's convenient. Of course, that's just how I like to work. to each their own ...