I did my 2R tip after the first 20 hour break-in. I don't know if I needed to wait, but it sure didn't hurt. Plus, it was incentive to hurry up and RIDE!
I think first investments are winch, wheel spacers, clutch shim, skids, tires, secondary spring. Then again, it all depends on what you are interested in doing first, and what kind of riding you do.
Or, just do EVERYTHING all at once and be done with it. I personally can't afford this approach, but I'd do it if I could.