Polaris offered me 3 types of belts: the OEM belt that came with the 900 Fusion (the exact same belt that's on the 500). One above that, and then one above that one again. After getting 1,761 miles out of the original belt, I figured it was worth the shot. If I can get almost one year out of the belt rated for a 100 hp machine, to get one rated higher than that (my machine can hit 140-150hp) I should get double that (or at least 3,000 miles out of it). Of course I broke the adjustor bolt... but it was under warranty so I just picked up a new adjustor bolt and replaced the old one with one that won't break as easily. Now I carry extra tools though (the tools that come with the sled do not have the ability to adjust your clutch; go figure).
I guess you get what you pay for, but this is the first time I've replaced a belt. Time will soon tell if I bought the right one
