Your question is two pronged. #1, I would not trade my water stones for DMTs. You are right, the waterstones are much finer.
In fact, they are way finer than any ceramics that I have heard of, which leads to your second question.
If you wanted to get DMTs, a 600, 1200, 2k ceramic rod progression would be great, and lend itself to fast touch-ups.
You mention Spyderco's stones. I would not use Spyderco stuff much. They are geared toward amateurs, IMHO.
What are you wanting to do?
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