D800E with 32G card nets me about 400 files(at 14bit).
Obviously this depends on the scene, but as a rough approximate go with figures that loo like that.
I also agree too tho, 1600files is probably a bit much on the one storage device.
The other angle to look at this tho, is if you do a lot of video.
My predominant capture type is stills, and have only done one session of video once(as a favour).
I have a 32G SD card simply for that purpose(if the need ever arises!) and it's other main purpose is really as the spare card, or backup card if the primary CF card fails for any reason.
But if you do lots of video, then such a large CF card can make sense.