If I had the money, my camera & lens of choice would be the Nikon D3s and 200-400 VR. In my opinion the D3s is fully usable at ISO 25,600. Take a look at this. It's considered by many to be the best DSLR camera ever made.
The 200-400 VR is fast, light(er), and has 4-stop VR. It's better at 400mm f/4 than Canon's 400 DO. And did I mention it's a zoom??? I wish Canon made that lens. But then again, Nikon doesn't make a 300 f/4 VR, 85 f/1.2, 70-200 f/4, etc.
The 1D III is a superb alternative. It is better than the 7D at high ISOs, especially where it counts most (check out 1D3 images at ISO 800-2000!). It has the 1D build and sells for the same (plus or minus a few $) as the 7D. I will say that I have used every one of the 7D's 18 megapixels. I don't think the pixel density of the 1D3 is a plus -- it makes it harder to pull out the detail on some wildlife. I dislike how Nikon's D3 bodies have only 12mp. That means to get reach for wildlife it's a 600 or bust. I don't think the slight noise advantage is worth that loss of mp.
I agree w/ John #2 (fastglass) that 1.3 crop is to save money. If the 1D bodies didn't have APS-h they might sell for more. But why then are Nikon's D3 bodies FF and sell for the same (excluding the D3X)?
For portraits and still shots of animals the 5D2 can be a better body. But you get less reach and much less power ~ smaller buffer, slower frame rate... 8fps is a LOT slower than 10fps. 4fps just doesn't compare. And let's hope no one is shooting wildlife at ISO 12,800 [:P]