Split has probably their most notable singular track ("Cherry Red"..an all time heavy classic), but I don't think it's their finest album.
for years I thought that Thank Christ For the Bomb was their best album as a whole, and while I still think it's incredible, I'm a fairly recent convert to Hogwash. It's a really dark, bitter record. I ride hard for it.
Tony McPhee also has a pretty killer solo record called Two Sides of Tony (T.S.) McPhee that's worth checking out. There's an acoustic side and a "synth" side. It kind of reminds me of Bill Orcutt at times?