I don't think you have to be too concerned. Keep in mind that ceramic disk caps are just about "bottom end" of the cap feeding chain, so you're asking for the highest quality of the cheapest, lowest-tech cap. But I guess that within even the ceramic cap category there might be a "good/better/best"?
BYOC usually uses Xicon ceramic caps where they're needed in their kits. They sell them individually too. Small Bear also sells Xicon. Small Bear has a different make Mil-spec cap, but I don't think in .22. It's 10% tolerance as opposed to the Xicon 5%?
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