Paul,

I'll second the vote for the Unicomp keyboards. They aren't split, but they are the best keyboards on the planet. Period. The "buckling spring" gives the best tactile/audio feedback there is. I am at least 20 wpm faster on my Unicomp than any other keyboard. They are indestructible, too. The "buckling spring" is what we used to call the "clackety keyboards" like on the old IBM terminals. There is nothing else like them. No ergo (split) design, and no USB, but worth it!

I have a UNI0P46 and it is the best computer investment I've ever made.

FWIW,
Jim