I've been using jumpers like those in your first link (although from a different supplier). They're just OK. I've had a few issues with them breaking at the end, or worse, going intermittent with no outward sign. OTOH, I've put a few miles on them. I've just ordered some of these
, which I think are a more robust version. That might not be the absolute best price out there, but I was ordering anyway. As for just plain wires, I typically get out the wire stripper and use what I have laying around, solid-core CAT-5 cable (24 AWG) or some old 4- and 6-conductor telephone station wire.