Curious, is all the $$$ you made from your GSXR being spent on the RC51? If it is this could really get exciting!!
And I saw someone said you had an SP1? If that's the case maybe talk to Ben and clean up an SP2 Swingarm for the Swap?
I cannot say by experience, but from what I have read a couple must does if you haven't are:
Suspension: Kyle Link or equivalent (Ben),
Rear Shock (Ohlins, Elka, Penske) As already mentioned
Re-spring your fronts over at Kyle Racing
PCIII: I hear it just tidies up the whole ride as far as throttle response. Makes things crisp.
All your free mods (I'm sure you've done these or are thinking of doing them)...http://www.motophotos.com/rc51online...ds%20Page.html
The undertail to tidy it up. New Lever's clutch and Brake. New Rear sets. New rear Hugger. New Front flush signal lights....
I love trying to spend your money. Like a bad ex-girlfriend!!! or a good one..haha