kosigns with kexo..............

Scenes From a Memory and Falling Into Infinity are damfine ceedees.
They are very different -- FII is more like TOT, a compilation of songs.
SFAM is a theme-based or "concept" album.....like a throwback to the 70s.
Both a very nice examples of DT's work.

Also......when you are ready to buy a Dream Theater DVD, get "Live at Budokan".....it is the best-sounding DVD available (and it has cuts from many, many albums, including TOT). It is the identical concert tour I saw last year. It also has a disc of bonus materials that are fun to watch.
Live Scenes from New York is also good but the sound is recorded at a low level.
All the other DVDs have production problems and, IMO, should be left on the shelf.