So, is there anyone who was never on Fania Records that's worth checking out?
Fania related stuff is easy to track down but I've no idea about anything else and surely that's like getting into soul without knowing anything that wasn't on Stax.
For people that know shit all about salsa, go here: http://faniarecords.com/fania/site/home.aspx
and here for a little mix of some cool shit: http://o-dub.com/sounds/soulsides/fania3.mp3
And look at salsa album covers too, because they're always brilliant.