Anyway, Dream Theater was a favorite band of the radio DJ who died in the Great White club fire in Rhode Island.
Otherwise, Rush and Yes for me.
I'm surprised that Porcupine Tree isn't on the list. They've been pretty popular of late and it's pretty good stuff. For those of you who haven't tried them, think of it as a combo of Pink Floyd, Rush time signatures(all over the place), early Genesis, and Dream Theater.