I would say only Images and Words and Scenes from a Memory are definitely perfect. A Dramatic Turn of Events is right on the line, and whether it is or not more or less depends on how I'm feeling about This is the Life on a given day. Same situation with Train of Thought depending on how I feel about Honor Thy Father. In the poll, I've given them both the benefit of the doubt.
A couple that come close, but fall short: Awake is perfect through The Mirror, but Lie and Lifting Shadows off a Dream are enough of a step down to miss out. And Dream Theater is one of their most consistent albums, but the quality level is not high enough to enter perfect territory, not because of a standout weak song, but because most of the songs (TEI, TLG, EM, BTV, STR, AFTR) are in that good-not-great range.
All the others have songs or elements that clearly detract from the experience enough to easily rule them out of contention:
WDADU: SS, LFAGA
FII: BMS, JLMB
SDOIT: Disappear and the ending of Misunderstood
8VM: NE
SC: Forsaken mainly, but only ITPOE and TMOLS really rise high enough
BCSL: AROP, Wither
TA: Like DT12 doesn't really rise high enough on average, plus the album is really too long.
Have only listened to DOT once.