Images and Words (1992)
Metropolis Pt. 2: Scenes from a Memory (1999)
Octavarium (2005)
Awake (1994)
Six Degrees of Inner Turbulence (2002)
A Dramatic Turn of Events (2011)
Systematic Chaos (2007)
Black Clouds & Silver Linings (2009)
Falling into Infinity (1997)
Distance over Time (2019)
Train of Thought (2003)
Dream Theater (2013)
The Astonishing (2016)
When Dream and Day Unite (1989)
The first couple and last couple are clearly where they are, and that won't likely change. I'll always say I&W is one, just out of loyalty, WDADU will always be last, simply because of the vocals. But within the little groups, things could change on any given day. Two through five are very close (Awake will never be two, and Octavarium and Metropolis will never likely be five, but still that whole group is virtually equal). The next two groups are, within themselves, basically interchangeable. I couldn't really rate which is better, SC or BC&SL.