>>5
Actually, I'd have to say the latest one brought it back to it's roots a bit more than the other ones have been. The atmosphere and feel of Castlevania was really there in Order of Ecclesia compared to DoS and PoR in my opinion. I felt that DoS and PoR started to make the CV series wander into JRPG territory (artwork aside) when it came to scenario and characters.
Really though OP, if it's a 2-D CV game it's hard to go wrong.