Agree on dischord. I started buying vinyl, and two pieces I picked up recently were Minor Threat "out of step" (not the original, sadly -- I think second pressing) and the Holy Rollers LP, which was a little later. I like government issue and scream, too - but then you're getting into paying more than I want to for vinyl (I think).
Also agree on the Mass sound. SS Decontrol, gang green ... all too thrash-ish for me. I love the mass sound from about 5 years later (Dino Jr, Lemonheads, Pixies, salem 66).
I've gone back and listened to the first Jawbreaker album a lot lately. Huge album for me.
Then there's the whole rockabilly/garage/punk stuff from the pacific northwest. Girl Trouble, Gas huffer, U-men, Kill Sybil, derelicts, fastbacks (one of my favorites growing up) and a million other bands that came before grunge.
So that's been my last six months in punk (and punk related) stuff.