If you like going thru hard drives like water then the D800 is for you. 1000 raw images fills 750gig of hd space. No thanks. The buffer is terribly slow too, thats why they dont offer medium raw because med raw would slow it to a crawl.
Actually that is not correct. If you shoot lossless compressed, which is the default, it averages about 45MB per shot doing typical landscape type shooting of high detail subjects. I went to one of my D800E directories and found 270 NEF file that averaged 45MB each for a total of 11.5GB size according to windows. If you multiply the 270 by 3.7 you'll get about 1,000 files. Taking that number a 1,000 NEF lossless compressed files gives you 42.59 GB. You are off by more than an order of mangnitude.
On an average my 5D3 takes about 28-30 MB in size. Assuming again 1,000 files, the 5D3 takes about 28 to 30 GB for 1000 files. The net difference between the 5D3 and the Nikon D800E is about 12-15 GB for every 1,000 raw files or about the same percentage that 36 mega-pixels is larger than 22 mega-pixels.