The original NES Castlevania is still my favorite, although I love virtually the entire series (with the exceptions of Castlevania Legends and the N64 games, which should be the last ones you try out). Of course the original NES game is cheap and easy to get a hold of, plus it's one of the best games ever with superb music and very challenging gameplay. If you aren't one to deal with challenge, try Symphony of the Night or Aria/Dawn of Sorrow, all very good stuff. Of the old GameBoy games, Belmont's Revenge is by far the best and one of the best portable games ever.
You've also left off Dracula X for PC Engine (TurboDuo), but that is very expensive (although a great game). Another related (and good) game is Kid Dracula for GameBoy.
In Memoriam RVW Jr.
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