my arm was about $300-500 cheaper than others but came highly recommended on psychobike.com/forums

Great site for info. (psychobike)

the above site is pretty cool. if I were you, i'd probably just get the top box removed on the swing arm. then you can get the bike lower in the rear like mine.

don't need the underbracing, don't need the bottle bracket if you don't plan on spraying, dont need air tank since alot of the air shifters come with the bottle for it anyways.

i'd get the extras though, chain guard, chain especially. don't need the other stuff.