Echoing the comments, you can't go wrong with any Armored Saint! This band has always been a me favorite!
The first AS I heard was the EP, the tunes are on Nod To The Old School if you can't find it and they are all brilliant.
Then I got March Of The Saint, which is my fave. That opening riff on "Can You Deliver" still knocks my jaw in the dirt everytime I hear it...
Delerious Nomad would be third and so on. Still need to nab the latest and I will probably have to get the 2 disc version of SOS just to be a completist.
The tune they supplied on "Decline of Western Civ. Pt 2" is a good one as well.
I was fortunate enough to see them a million years ago on the "March" tour opening for Metallica on their "Ride" tour and man did AS blow me away! Will never forget them slapping hands and Gonzo giving me a good natured headlock noogie. Great night and you could tell that AS was just as pumped to be playing as I was to be watching!