Dynojet, Vance & Hines(I believe a repackaged DJ), Yoshimura(expensive!), and Factory all make a jet kit for your bike, from what I've seen they all only offer a stage I, they all retail for around $120 except for yosh, which is like $220, obviously you'd get them cheaper from one of your team's sponsors, or probably find one on e-bay... for the most part the difference in stages is the selection in jets, a stage III will have a more extreme size selection of jets, usually for guys running open exhausts and who have removed their air box and are running open carbs or individual pod filters, it will give you most of your power wide open and high in the rpms, more for drag racers, in your case i would imagine a stage I would be just fine

M4 offers a race mount(kind of between a regular and high mount) that retails for $290, so i'm sure you could get one dirt cheap