hi guys.. i did a search and cant seem to find the info i want. im replacing the sprockets and chain on the monster (600 if that helps) as theyre quite worn out. now ive managed to get the sprockets ok, but was looking at the chains. initially i was told to go an RK GXW which is an 'X' ring chain. i have also been told that a DID chain is the goods too...but it may be an 'O' ring chain. And there is also an EK chain which is an 'X' ring chain. What I want to know is this....Is the 'O' ring chain any good? Is the 'X' ring any good? Why would I choose an X ring over an O ring or vise versa? And what are these brands (RK, EK, and DID) like? thanks guys and gals for the input.