I don't really see why everyone likes Octavarium so much. Don't get me wrong, it's a great album, but it's not one of my favorites. I tend to not listen to it much, much like 'Falling into Infinity' (probably the least good album). Maybe I was let down a bit because I had high hopes for it. But to me it just seems a bit 'hollow' (only word I could think of to describe it).
Personally, my favorite album is 'Scenes from a Memory'. I think it has the best mix of awesome music, diverse tracks and interesting lyrics. I remember when I first borrowed it off a friend. I went through a phase of listning to it every night, start to finish, for about 3 weeks in a row.
Strange Deja Vu
Home (one of the best DT songs ever)
The Dance Of Eternity (awesome ragtime solo)
The best thing about it is that every track is a good song, something that really makes a solid album. There's a feeling to this album that I haven't encountered on any other Dream Theater release. Seperatley, the songs are great, but when you listen to the whole thing, it is truely an experience. In a word, it's a masterpiece, something I don't think Dream Theater have managed to capture with any of thier other cds, although 'Train of Thought' comes close.