Here Austria, I'll save you from a lot of guessing (Didn't really realize you would interpret the mention of BDA as a hint) - the only BDA song that made it on my list was Rosette, and that's already been guessed. XD
-There is definetly a shu-t song in my favorites that hasn't been guessed yet.
-Here's the big one; there was a thread here on UtaForum (half recent, it hasn't been updated in a bit but it isn't ancient) where people would post songs for some reason that I won't reveal because that'd make it too easy. In that thread I used it to often show/force people to listen to songs I really like. Find that thread and you'll find some answers.