Apparently Harmonix is thinking about making a new RB game, most likely RB4. Whether you like it or dislike it, (I only like the drums and maybe the singing, depending on the song), you have to admit, it would be cool to get another DT song in RB, due to how fun Panic Attack was. Besides, DragonForce needs to be knocked off their throne. I was able to beat Constant Motion on Hard (Drums), almost beat it on Expert, but Panic Attack destroyed me even on Hard. Heck, it was hard to 5 star on Medium. Here's my choices.
The Glass Prison
Six Degrees (final song in game, complete with CGI cutscenes about the story in between sections)
A Nightmare to Remember
Blind Faith (would be so fun on drums)
The Great Debate (would probably never get in, but this one would be one of the hardest in their discography)
Breaking All Illusions
Scenes From a Memory (Album DLC)