Err.. God damn, I can't really do it with complete certainty, it's too hard
. But in this exact moment right now.. um... A Mind Beside Itself? It's got a bit of everything, and it's pretty epic as a whole.
If that's considered cheating then fine.. I pick Voices. - It's a very subtle and yet dynamic piece with lots of build up, great vocal delivery, weird mysterious lyrics, and one of the best guitar solos ever. Any DT song that can hold my interest for as long as this one would have to be a stellar track.