Whenever someone asks me that question, "Where do I start?" (when it pertains to DT), I always tell them the same thing: Start at the Beginning.
By that, I don't mean the Majesty Tapes, but rather Dream Theater's first album, "When Dream And Day Unite" and go from there. I started listening to DT when Images & Words came out and it took me quite a few listens to really appreciate WD&DU because it was almost a different band at that time (not solely contributed by the fact that Charlie Dominici was their Vocalist). From then on, work your way up to present day stuff, I think that it is the best path to discovering the evolvement of the band and why they play the way they do.
"Suspended Animation" is pretty freakin' sweet, though. I usually play the first track of it on my way to my Hockey Games to get me all pumped up just because it's such a tough song. Hope this helps.