sour cream and onion or just sour cream and no onion?
He has to mean SC & onion. I've never seen plain sour cream flavored potato chips.
I chose SC&O out of these three options. I like BBQ chips too. I don't dislike plain chips, but they're just so ... plain, so I'd probably leave them alone.
IF I had my druthers (sp?) about all potato chips, I'd go the Art & Mary's Jalapeño route, without any hesitation.