Right here.
Images and Words is by large demand, the best Dream Theater album. The only song on there I don't like is 'Another Day', and that's because it's a matter of personal taste [I don't much like the songs that sound like intro's to Soap Opera's]
Also, Pull Me Under is definitely Dream Theater's greatest.
Though at the moment, I've been partial to their album, Train of Thought. They take a turn for the harder kind of rock, much like in the album Awake, also good.
Might I recommend their album Scenes From a Memory?