I have had great success with KMC chains. Very nice quality, shift well. I've recently started using their X chains, partly because a mechanic/shop owner in Richmond, Vermont that I trust stocks them. For my 10 speed bikes, the KMC X10, for 11 speed bikes, KMC X11. Comes with the MissingLink, which I like a lot. Easy to put on and take off. Since they're around $25, you can change your chain yearly and not break the bank.