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Same here. I lap my Shapton Ceramic Pro stones on a DMT325 without any problems. I lapped a 16k and 30k glass backed with it as well.

You can't go wrong with Thuringian. I haven't me anyone yet who didn't like a Thuringian edge and you'd get one in your budget.

I prefer natural finishing stones. I've got 2 JNAT's, a Frankonian and 3 coticules that I use. Oz made a very good point. What do you want from the stone? That will help you decide.