chain

Nah chains are all the same just go to your local Wal-Mart and buy one there.

Depends on what you are looking for in a chain, I wanna ride a odyssey key chain with hollow pins when I get a new set up for my trails riding. If you grind alot I think a good quality half link would be worth getting, like a shadow supreme or something. I don't know as much as I should about chains though. Just get something with mushroomed pins and thick plates, weight doesn't matter too much. The fly tractor chain is meant to be good too

Depends how much you like your kneecaps? How much do you figure those are worth ? And above all how fast do you go ?

Don't get the shitty Bell chain from Walmart. It will snap the first time you ride it.