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Let me add a disclaimer, I've never used a DMT. I'm just saying, 300ish grit is pretty good for most rocks, but trust me, you're gonna want somethign rougher, either for cheap stones you want done...

I would advise to get the X/C combo.... the C will serve you forever, like Jimmy says, but when you need that extra gear you'll be able to downshift and power through those barber hones. Or at least...

From what it looks like either will be fine I bet. Word of caution... barber's hones and other hard rocks will beg for the X-Coarse, or even a XXC. Lapping on 325 seems unfathomable. If it were me...