So, what if I have an obsolete LE from Nevada? Which category does it go in? I prefer Richard's suggestion of good search criteria. I don't think all these categories will help, because the chip you're not finding now will still be lost, in the wrong category.
An "obsolete" category is particularly worthless. Heck, we can't even agree as a club what obsolete means. How would someone know if a chip goes in that category? If you really want to break things down, I could support a "Nevada" category, with a few other regional categories to go with it. But no "subjective" categories, please.