The genuine American AC delco was the best. Its hard to find a genuine AC delco part, even if its in a genuine looking box. Also most places you can still get them from (online) dont seem to honor any kind of warranty.
I used BWD from Oreillys and its been in there a few years, just make sure to use a good heat sink compound under the ICM, not the clear stuff that comes with it.
[This message has been edited by 2.5 (edited 03-28-2014).]