I was just thinking about doing a poll about this, but with songs that they haven't played with MM yet... This is a good idea too.. I could anyways do the poll a few weeks from now with the songs orderly according to these results so is easier to find the songs for most (I was thinking of giving 5 options)..
Ok, so I'll make two lists, in order to answer both questions..
Songs I like to see/listen next time I see them:
1) *any song from Train of Thought*: favorite album and out of the approximately 75 songs I've already seen live none of them was off this album.. I could've easily full the three spots with songs from this album, but feels like cheating and/or pointless..
2) Octavarium: well, talking about cheating, if someone is asking me what one extra song I'd include in a given setlist if I have that power, I'd surely use my gift to choose between the epics, and while this isn't my fav epic (TCoT is) I haven't see it live, as many other ppl..
3) The Ministry of Lost Souls: yeah, I've heard here and there that this song live might loose some of its strength, but I'm willing to live, die and kill to verify it.. I just love the song, and even when is a very unlikely option because is not a fan favorite and also takes a lot of time to the setlist, I'll continue to pray for seeing it at least once..
Ok, and now songs they haven't played with Mangini yet that I like to see... someday soon:
-Erotomania: sick instrumental (also, it's not in any dvd)..
-Voices: because you cannot play the previous without playing this one.. Not a big fan of it, but only the beginning and the "thought disorder-dream control" section make already the song very worth to see it live (also, it's not in any dvd)..
-Surrender to Reason: killer song, and one that will definitely see the light in one of the next two or three tours for sure (also, it's not in any dvd)..
tl/dr: you just missed lots of DT lyric references..