A word of advice on the CF readers...don't assume all USB2 readers are built alike. I have a SanDisk Image Mate 8-in-1 that seemed quick enough to me with both SanDisk and Lexar cards. Then I read about the Lexar Pro CF Firewire reader and how fast it was...soon followed by another article I found about how SanDisk's latest CF-only USB2 reader, model SDDR-92 and marked on the packaging as incorporating "EPP" (I think that's the acronym) technology, is even faster than the Lexar Firewire. Apparently, a CF reader may well be optimized for peak performance with same-brand CF cards. So, for $20 I bought the SDDR-92 rather than spend $70-80 for the Lexar Pro Firewirereader, and I'm very pleased with the performance.
A co-worker who thought his Lexar Firewire reader would be much faster than my USB2 reader, recently brought it to work for me to try out. With a SanDisk Extreme III 4GB CF card loaded with 1GB of image files, the SanDisk unit read the files off to my PC in 1/3 the time of the Lexar. With a Lexar 80X CF card, the SanDisk unit read that card in about 1/2 the time of the Lexar reader.
So, before you rush to spend more for a Lexar Firewire reader, I suggest a comparison to a SanDisk USB2 reader is prudent. Looking at Lexar's website, they've got two Firewire CF readers, one being the Pro model, but neither of which look like the unit my co-worker had. So, it may well be that the read speeds are improved in the newer versions, and maybe that is why Craig is so pleased with his.
Meanwhile, echoing other comments, I too have been pleased by the performance of the Ultra II and Extreme III CF cards in my D200. The Extreme indeed supports a higher burst count than the Ultra II, but both support lower burst counts almost equally well. NEF file storage for the D200 is uncompressed NEF by default while compressed NEFs are the only option for the D70/D70s. That too affects how many raw files can be written to a given size card.
Daryl