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I've had good luck with stock-type replacement exhaust parts from Summit Racing- I think the last ones I bought were Walker? I've bought truckloads of parts from Rock Auto too and usually they are OK. Anyway, I'd just go stock replacement for all of it and I don't think there would be much quality variation amongst brands for the pipes. They cut some pipe stock to length, bend it, and weld some hangers on. I would strongly recommend stock-type replacement mufflers over the "hot rod" stuff; the extra noise and resonation issues they inevitably bring do NOT give you any more fe in exchange. O2s- probably any brand is OK but for sure you can't go wrong with Motorcraft for your Ford, or Bosch.
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