I currently have an Izumi ESH on my Pista Concept, which was the cheapest njs chain at the time, but has been discontinued. I've only used it for one season on the track, so I can't speak to durability, however, it is very smooth running. I has a screw and nut type master link, that is an njs requirement. Prior to that it had the stock KHS chain, that was badly worn after 3 seasons. I suspect a good cheaper chain like a SRAM PC-7X or regular non-njs Izumi would work just fine, but I figure with all the money I spend on racing, what's a few more bucks on a chain.