As much as I love some of Kanno's work (Macross Plus is still my all-time favorite anime soundtrack and is just fucking mind-blowing when you compare it to her other works), I'm afraid I'd have to disagree on this one. I don't think she's suitable for CV. Maybe Zelda, Adventure Island, or possibly even Metroid, but not Castlevania.
The next CV composer should totally be Hyadain.
:end troll mode:

Yuki Kajiura would be a better pick. Or Joe Hisaishi. That's a bit of a surprise twist, maybe, but when it comes to repetitive music (which is what video game music is), he's quite good. And the dude has a decent range of musical styles. Yeah, I just called Joe Hisaishi a dude.
My top pick though is, in all honesty, Susumu Hirasawa. I will stand by that one to the death.
OOHH! OOH! The guy that did the soundtrack for Urotsukidouji! That's a good one!