Music For Nurses might be my favorite EP of all time. I agree that the songs you mentioned are badass, though Paper Champion is my favorite on the EP. What I love about it is that it flows like it was one long, ~25 minute song, and for the last 3 songs for example, I didn't "hear" the separation parts until I started looking for them, they really flow well together.
Self Preserved is quite fantastic for me. I know some people complain about the two softer songs in a row, and while I see their point, it doesn't really bother me. Self Preserved was the first 'Size-album I got into, and I still have very fond memories of the album just because of that, and it's still a really good album. Songs like "Superimposer", "Build Us a Rocket Then", "Silent/Transparent", "Pine", these are just some of my favorites, but all in all I don't think the album has a single weak song.
Everyone Into Position is fantastic indeed. While it has a few more "straight forward" songs, it also has some of their best experimental stuff on it as well. "Mine Host", "Music For a Nurse", "Ornament/The Last Wrongs" for example.
And while a few songs are more "straight forward", I think they are fantastic considering that fact. "Meredith", "The Charm Offensive" and "A Homage to Shame" for example are all slightly more accessible, but amazing never the less.