Slint broke up about five or six years before Mogwai Young Team was released, but I didn't hear them until ~2004. Saw the reformed version in 2005 at the Forum in Kentish Town and jolly splendid it was too, although I think the drummer was pretending to be asleep for the first three numbers.
EITS' first album dates from 2000, so well after.
Edit: I keep missing whatever A Silver Mount Zion are calling themselves this week for much the same reason as Deano chiz.