New Alternator To Avoid
Buying a rebuilt or "new" is a total crap shoot anymore.
Used swap meet or junkyard parts are probably better.
I found a local guy who rebuilds (and tests!) alternators and starters.
For about 100 bucks I got my original upgraded alternator rebuilt and it looks like new! He upped the amperage a little at my request though I have no added on electric loads.
I'd recommend doing the same.