I've had good luck with the alternators and starters from BnR. I guess I've been lucky. I was a little pissed when I purchased one of their tii alternators and it came with a "too small" pully. I ended up just swapping the stock pully onto it from my old alternator. I have too many spare fan belts in my stock of parts, that I'm not changing sizes any time soon. What pissed me off was they install their small pullys without a key in them, so they spin when you try to hold the pully and undo the nut to do the swap. I had to use an air tool to undo the nut. Other than that, I've had two starters and two 85A alternators going strong for over three years now... Knock on wood, or aluminum
One tip, make sure that you secure a really good ground wire between your alternator and the block. Makes a huge diference in how they work. Also, don't overtighten the fan belt. You don't want it to squeel, but you don't want it too tight.