I'm skipping Theatrhythm. Kingdom Hearts I will strive to get, seeing as I feel guilty missing Re:Coded and BBS.
You should really play BbS if you get the chance to, I understand not buying an entirely new console for the sake of one game. Re:Coded is the abomination of KH.
Interesting release date for KH3DS, I may begin to save for a 3DS so chances are I'll be picking this up.
I concur, you REALLY didn't miss anything with Re:Coded. I mean, the secret ending is sort of important, but a quick youtube search will get you that.
On the other hand, I've only heard good things about BBS, so I imagine it's worth it.