heres my take on upgrades, in order, ebay for budget minded, good used stuff where possible..................
1. Oury grips
2. works shocks up front, elkas if you can afford them
and at least a 400ex rear shock
3. rims and tires, my choice is banshee/warrior/yfz rims and rear hubs to
match, tires....holeshots/razrs or kenda's 20" rears and 21/22" fronts
4. full hydro brakes front and rear if ya don't already have an 03+
5. intake upgrades.... carb, vf3 reeds, uni filter and cfm airbox
6. right bend pipe/silencer f7/lrd/dynoport, , they'll let you grow if ya decide to go bbk or ported stock cylinfer
7. i'm leary of the availablity of bbk pistons, so a ported stock cylinder/head mod is my choice, as is ken oconnor racing to do the work
these rest i add as i find good deals....renthal or equivilant bars, bumper/grab bar, nerfs or at least yfz heelgaurds, skidplate, ez pull clutch lever
and finally splurged on wider a-arms, axle and extended swinger
as for clutch kits, i've heard good stuff on the cheapy tusk kits, but the "driveline specialties" or "barnetts" are prolly the best, IMO, as is all of the above of course