The only album I've heard in full is "Workingman's Dead", which I bought back in high school when I first started checking out classic rock because it was in the Rolling Stone album guide. I hated it but to be fair, at the time, I didn't really want anything to do with anything that smacked of country and that's obviously changed. More recently, I tried to listen to both "Live/Dead" and "Europe '72" and had to switch them off after a few minutes. I like Jerry's guitar but generally can't get into their material- the vocals often sound awful and the songs don't really appeal to me on a melodic/compositional level.
Don't think I've ever heard "Triangle" or any of The Beau Brummels' other albums. In fact, "Laugh Laugh" might be the only song of theirs I know- it's a good one though, definitely one of the better tracks on the "Nuggets" box. Own most of Quicksilver's stuff but can't really deal w/ Dino's goofy Bugs Bunny vocals or meandering songwriting so I can only really handle the first couple of albums and the "Lost Gold & Silver" comp, though I'll admit that it's all kinda stupid. Moby Grape, on the other hand, is a group I'm a pretty big fan of. Their debut is one of my favorite albums, their 2nd and 3rd albums are both really good (and really underrated) and they've got some other good album cuts and rarities here and there. All in all, they're probably my favorite group associated w/ "The SF Sound" along w/ Jefferson Airplane, unless you count Sly & The Family Stone, who were into their own thing (see what I did there?)