I like Dream Theater quite a lot. Scenes From a Memory is good, but if you like that, you should check out Images and Words and Awake (my personal favorite). My favorite part of Dream Theater is not their technicality. They are ridiculously skilled musicians, but I think their lyrics and compositions are usually their best feature. Lyrically, Awake is a very dark album, and I got into it at a time when I could relate to much of the lyrics (Lie and Space Die Vest especially).