Things i wish i had done to my bike before the expensive stuff...
Pazzo Levers... you might think, whats wrong with my stock ones, they work... trust me, with the adjustments that the Pazzos are capable of, they make a world of difference... for me anyway...
Aftermarket windscreen... (taller than stock) Love mine, glad i got it as one of the first mods...
Throttlemeisters... if you ride any distance, these will save your hand from cramping up... they are a manual cruise control if you will...
Those are just few things off the top of my head...
You should wait on the PC and the dyno like busawhipped says... with slipons, your not going to do yourself much good with those. Save your money and upgrade the rotors, pads and lines. Everyone on here that has them talks about the night and day difference between aftermarket and stock brakes.