if it were me i'd start by getting some hd fork internals (springs and damping rods, best set up is 1 hd spring 1 stock spring IMO), elka or fox shock, hd peg bar and pegs. a nice billet top clamp would go well with the tall bars you have and that'd leave you with a nice adult proof stocker. as said all depends on budget. then look at big bore kits and air box removal kits- if you go bigger bore you'll want the 4th gear drum, possibly a manual clutch too which mean's you'd want the primary drive gear or the secondary clutch removal washer.
get modding and post some pics! :coolthumb: