Ok, i guess i could go with that

The hard end of medium though
Tau is more like Nightmare mode right now

Daemons likewise.
DE, Eldar and Oldcrons could be Hard mode, i suppose.
I don't play Eldar (though my wife does) and
DE are my other favourite army, but they definitely take a fair bit of finesse.
Oldcrons were my preferred Tournament army until the new codex :( Winning a tournament with them was really a rush