I had a KHE, it was fine (a bit of a stiff link when I fitted it, but nothing that bad). After a lot of stretch to the point the snail cams were maxed out, I got a KMC. I must say that the KMC felt so much nicer, I swear it makes my bike feel alot more responsive. That's my experience anyway... why don't you just get a new KMC? Every chain stretches after a while and if it was OK until now then a new one would be fine, surely? You don't HAVE to get a different one.