Didn't think I was going to be able to do this.
In no particular order:
Metropolis
Learning to Live
Scarred
A Change of Seasons
Home
Blind Faith
SDOIT
Octavarium
Breaking All Illusions
Illumination Theory
Honorable mention: Stream of Consciousness
I wasn't sure I'd responded in this thread.
Looking at my list, I think I would probably remove Illumination Theory - not so much that I don't like it as much, but because I think there are stronger songs.
I have no songs from WDADU, and that wouldn't change. I might theoretically take the Live at the Marquee version of The Killing Hand, but that's cheating (I think).
I have no songs from FII, SC, BC&SL, TA or DOT. Don't think that would change either (definitely not as to the first four).
Thinking about my next favorite songs from the other albums, I'm thinking the most likely candidate to replace IT would be In the Name of God. Or maybe Finally free or Fatal Tragedy.
EDIT...because it's not just
A Killing Hand, it's
THE Killing Hand.