And I'll go ahead and tell you that as long as you are investing in the Rolls Royce of PV's, you may as well get what you need. The O-rings are a vital part of the function of it so it never hurts to keep a stock on them.
Many of us, myself included, keep several full sets for each device we own. We have a thread in the srtrickies with several vendors and the sizes you need. Including shipping, you can get all you'll realistically need for 12 bucks or so.
Buying them assorted sizes is okay but you waste a lot om money. If you go to a dedicated O-ring online vendor, you can get only the sizes you need for spares. Besides the 2 springs, they are about the only thing that can wear out since the GGTS and Stealth are made of steel now.
As for the scratches, if you stay on top of keeping your GG shiny, it isnt a big chore. I have my TMF #1376 that sees many hours of daily use and it only has 1 scratch that I can't polish out. and I'd have to point it out under proper lighting for you to see it.
My only point is that they are like any other item - If you start and maintain routine that includes polishijng and cleaning, it'll be easier than waiting and realizing it has turned un-shiny on you.
