If there's a plus side, colour proofing between CMYK and RGB didn't show any obvious changes. So there's that. The guy I'd sent it to seemed indecisive himself on what kind of printing method it'd be. The problem is that, with this little set of projects I'm doing, doing little imagery for folks around town, a lot of them put a lot of faith in me, so if it helps I suppose I'll go with your suggestion and send JPGs, PDFs and PSDs (would TIFFs have no value?). I guess that way, they in turn can send all three to their printers to decide which one would be best? I was also under the assumption that JPGs were not recommended for this sort of thing, considering how much they downscale the file.
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