I need to get a new set of sprockets and a new chain BADLY. My teeth are seriously worn. Only problem is my dad wants me to pay for it. . I have enough money for the Ironman but I dont really want to spend that much. Would I get the same amount of life from a sunstar or JTsteel sprocket? I mean its only 1lb of differance..... Also, o-ring or x-ring? I know that x-rings will last longer but I dont want a chain that will outlast my sprockets because that would be a waste of money. Thanks for the help!