I am need a new rear brake rotor and have a few questions. I have looked all all the ones out there and the price can be $50 to $200. Now I don't think I neccessarily need a super rotor, I don't want to purchased one and have to replace it 3 months from now. I see ones on Ebay that have a cool looking design but are not a brand I see anywhere else but ebay which doesn't give me a good feeling. Is there a material that is better then others?