Just find me. I have most everything for the 600RR available at the track for twice the retail dealer price.
On the RR the biggest crash damage items are going to be the levers, shift rods, windscreen, pegs, clipon bars and fairing stay for simple crashes.
Where the budget and space in your hauler allow:
vortex pegs, foot brake and foot shift levers.
if your still running vortex, the bolt that goes into the shifter pivot point! I have one if you ever need it.
Safety wire for you oil plug! Then you don't need a spare plug!
just the bars for the clipons. I drill all the bars I carry to fit controls for left or right side. That way they're quick to swap.
Throttle tube and grips may be nice if you break the clipon tube
brake and clutch levers
zip ties and duct tape!
Windscreen. You can get away with any year in a pinch 03-06
Caliper and pinch bolts! They round out easy (especially the pinch) You don't need oem bolts, but get flange head bolts of the right length strength and thread for these two items!
Misc. bolts. Watch ebay and get some metric sets from a sportbike part out
Wheels and rotors are nice
master cylinder or at least the cap. (caps get scraped bad when a bike flips)
sprockets and chain
spacers, for when they roll away and you can't find em.
sprocket carriers (cheap on ebay, or I have plenty) so your sprockets are mounted up and ready to go.
fiberglass repair kit
case covers, especially if you don't have guards
The stuff is cheap now for our bike if you shop for it on ebay and the cbr boards.
If I'm going racing, i bring spare everything I have! You never know what you'll need. For a trackday, you'd have to crash pretty damn good to not get back up and riding in an hour or two with what you bring and I may have with me. If it's a wear item and could bend in a moderate crash, get one where the budget allows. Beyond that, thats why I ride with Nesba, crash insurance on your track day fees