Hmm, I'll try it out, btw what is the difference between Castlevania and Metroidvania, I don't even know what the latter is.
IIRC, a 'Metroidvania' is one with a map that you can gradually explore as you get further through the game, e.g. get 'Massive Hammer' so you can finally smash that lump of stone blocking the path you found near the start of the game, and go to the new zone, that kind of thing. Like Dawn of Sorrow on the DS, not sure about the other DS ones, though.
Also, I might get this. Symphony of the Night was supposed to be very good, wasn't it? And that Rondo of Blood remake doesn't look bad, either...