I have always gone with the X-ring chains and have had great luck. O-ring chains are just about as good.
Your bike uses a 520 chain. You can buy the factory length chain from places like Rockymountainatv.com and it will ask you to input the year, make and model bike. Or you can buy a 120 link chain and cut it down. Just count how many links you have now and buy that size if you aren't changing sprocket sizes.