KH2FM is an amazing game, it picks up the story after Chain of Memories and with the Final Mix changes its nearly my perfect game. KHBBSFM is a great game with a sad tail that gives context to events in KH1 and events later in the series.
I will never ever forget the impact Kingdom Hearts as a series has had on my life. I love everything about it. I'm bias but, please if you find yourself in a dark place, experience this series with an open mind and fall in love with it.