Which Castlevania would you want rereleased more than any other, on any system? But JUST that one, knowing that the one you pick would be the last Castlevania to EVER be rereleased.
Which would you choose as the last hurrah of the games from your memory?
Mine would probably be (oddly) Circle of the Moon, as to me the game speaks to two different eras of the franchise: there's the gameplay, which speaks to the IGA era, and then there's the unforgiving difficulty for those who simply plow right through, which speaks to the classic era.
Add to that a killer name, a decent plot, a well rounded (if derivative) soundtrack, and you have yourself a CASTLEVANIA, my friends. Proper Castlevania, at it's finest.
Runner ups:
1. Aria of Sorrow
2. Super Castlevania IV
3. Castlevania 3
Yes, there's always the Virtual Console releases of SCIV and CV3, but I'd love to see them rereleased for Sony and Microsoft's fun boxes too. Possibly with an HD paint job.