Black Clouds & Silver Linings
Greatest Hit (...and 21 other pretty cool songs)
Systematic Chaos
Score
Octavarium
Live At Budokan
Train Of Thought
Six Degrees Of Inner Turbulence
Live Scenes From New York
Through Her Eyes
Scenes From A Memory
Once In A LIVEtime
Falling Into Infinity
Hollow Years
A Change Of Seasons
Awake
The Silent Man
Lie
Live At The Marquee
Another Day
Images And Words
When Dream And Day Unite

EPS, Singles, Bootlegs (some of):
2006 - Dream Theater - Dark Side of the Moon (Pink Floyd cover)
1986 - Majesty Demo [EP] Independent
1987 - Instru Mental [EP] Independent
1987 - Instru Mental II [EP] Independent