First off welcome to BHQ!
I would start off with pipes, filters, cool head or milled head, timing plate, reeds. Start off with some basic bolt ons like these and see how you like it. MAKE SURE you re-jet with any mods that change your air and fuel flow.
If your still wanting more power you can have it ported, bigger carbs, 4Mil...etc. The sky is the limit on these bikes, and just all depends on much $$$ you want to dump in it and what kind of riding your doing.
I would suggest calling a site sponsor for any parts or work you mite need done, any sponsor on here will take care of you.