Re: Should I just upgrade the 10 bolt?
If it were me, I'd look for a 12 bolt housing. Then, the slow accumulation of gears, posi, axles, brakes (could want disc by then). Unless you have a large wallet, your best bet is to save up. Why go with the 12 bolt vs the 10 you have now? Well, the 8.2 isnt the strongest, even with sticky street tires. Even a 8.5 would be better than that. Some might say a 12 bolt built up is overkill on the street. Depends on how that rear is built, and what parts you have in it.
Who knows, during all that saving, you might find a craigslist ad for "Chevy 12-bolt Posi, 3.55 $250". Though I paid that much for one of mine, I still have the original 12 bolt open rear I started with.