Which plugs are best for performance?

What I'm saying is; if the coil can pump electrons across the rotor gap that measures infinite resistance, I don't think it cares about a few 100 or few 1000 ohms at the plug end, just before another infinite resistance gap at the plug tip.
Kindof like throwing pebbles into the ocean.

Just grab the end of that wire sometime, and see how hard a time the coil has in finding a ground through the human body.Last time I checked the human body has a lot more resistance than 500 ohms. IMO, the coil could care less about that little resistor.Well,almost any automotive coil,that is.