You really can't go wrong with the Metroidvania games. Everyone has their favourite, Symphony of the Night being the most recognised game, though Order of Esclessia and Portrait of Ruin (both on DS) are huge favourites of mine. The two games set in the series "future" - Aria of Sorrow and Dawn of Sorrow are bloody brilliant as well so its really up to you which to go for. The first GBA game is great but it suffers from small sprites and being fairly dark, while the second GBA game has better sprites but awful music. Its also incredibly by the numbers, felt too much like they were trying to mimic SOTN without really bringing much to the table. I still enjoyed the game, but its the worst of the bunch. If you go for Portrait of Ruin, make sure to play the Mega Drive game first - Portrait is a sequel to it featuring certain characters from the MD version. Its also worth mentioning the MD version is censored depending on the version you play - The Japanese one is uncensored - with nazi skelletons, blood, holy crosses etc. while the American version gets rid of the nazi's and maybe the blood, and the euro one gets rid of even more (its a boomerang, not a cross etc.)
Your near the end of CV4 now. I think you only have 2 stages left, 3 at most. Once you beat Death your basically done.
Also, if you do play SOTN, try playing the PC Engine game first. SOTN is a sequel to Dracula X, so much so that the "prequel" chapter of SOTN is a toned down version of the end of Dracula X.
The Chandelier bit is my favourite bit in CV4 I think. The music, the dread (of falling) etc. just blended together really well on that bit.
Lastly, the "II" icon basically means you can throw two items at once (two crosses etc.) Its real handy for bosses, in that you can decimate them even quicker that way!