If you have the fully adjustible Showas on your SP, I'd say the best "Bang for your buck" would be to send it to BCM and have them change the fork oil, get straight rate springs for your weight, and revalve the forks (Racetech goldvalves) using their shim stack. I had it done at BCM and it really makes the bike handle that much better - so much so that I haven't thought about going to the SBK fork conversion.