The ceramic knife thing is a tough one. I was just thinking about the same thing, and there doesn't appear to be a lot of options. For ceramic folders, boker seems to be the only game in town. However, the gamma/infinity both have some metal in them, which could be of concern for certain applications.
In fixed blades, Mad Dog has what appears to be some amazing stuff, at equally amazing (read high) prices. No metal in the LE version, and a metal strip in the 'consumer' version.
If you need non-magnetic, rather than ceramic specific, the titanium is a great choice. Several choices there; any knife site's search feature will point you to them. There are apparently other non-mag materials/alloys, but I'm not clear on the specifics of the various options (Stellite, Boye Dendritic Cobalt).
After poking a bit, I'm thinking about a synthetic/composite/laminate style knife, which clearly doesn't get or stay as sharp as any metal, but satisfies the some of the same "subjective criteria".
Hope this helps...
-Bill