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well in about 1 second, you will get 4 shots... haha jk, I'm also curious about the buffer.
I would imagine that it wouldn't be mind shattering considering how large the files are though. You probably would want to get the fastest card you can afford so that the camera has the least amount of resistance in getting files out of the buffer.
Have you considered going d700+grip? Thats good for 8fps.
I've considered it and dismissed it. It just doesn't appeal to me. If anything I'd get a D3 over that but if I were getting a D3 then I'd want to get a D3S and if I'm getting a D3S I'll be dreaming of a D4 even more.
The only reason I am considering a D800 at this point is it gives me new gen tech in an affordable body, of course being available is a different story. I might be waiting long enough that I either build more funds to where a D4 is in reach, validation being no where in site, or the D400 meets my needs and I stick with DX.
For chasing squirrels with the D800, use DX mode (better for reach anyway and you get smaller NEF files) and get the battery grip. That combo is good for 6 FPS.
Exactly what I was thinking especially if the buffer is basically endless. Of course I gotta buy a D4 battery and all that so the cost goes way up into D3S + TC territory (for my reach issue).