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2000 R6? I believe that comes with a 525 chain and sprockets. If so I don't think the 520 kit would be worth the trouble or money unless you plan on making a noticeable gearing change. I would go for the SS brake lines. Speaking of tunes, is there any place in the 757 area that can dyno tune a bike w a PCIII?
520 is less weight. the sprockets are lighter. but thiner. they wear faster, but your looking at getting any extra whp than id go 520. there kits are the same if not cheaper than 525 kits.. and i would atleast go 1 down in the front.
and as d.nick said where i work is the only dyno in the area that is a "tunning center".