I bought a "white box" replacement from RTM Racing recently. I needed to replace my old one as the interior lights were flickering with the old alternator. This one has been good so far but I also haven't exactly put a lot of mileage on it yet.
After doing a lot of research I bought this from RockAuto.com 90A Mitsubishi Alternator & so far all's good. BBB Industries is the new electronics division of Remy. Remy used to be AC Delco's reman. sub before GM had to sell them off.
Is the current one OEM? If it is salvageable (new brushes) then that is a great option. You can work with a local motor repair shop that specializes in such things or ship it out to someone who you trust to do the work.