gt85 is pretty good, also tf2 is realy good, its what we use in our local bike shop and kicks ass, also if you go to a decent bike shop you can get 'dry lube' which is realy good and lasts for a while... but khes will go stiff if not lubed and especialy if your chain line isnt strait or the chain is quite tight... i also found the black ones go stiffer quicker probs due to the extra layer of paint making it a bit stiffer... lol and dont get a kmc... i used to snap one about every 3 weeks lol my last khe lasted me like 2 months lol theyre a hell of a lot stronger