I myself stick to original, there's just no beating that OG resolution, game looks goooooood. I love Igavanias.
Inverted castle didn't feel as good this time around... it's clearly inferior to the first half, which I hadn't really noticed the first time through, but the game is still an unmitigated success on pretty much every level. Always a pleasure playing Castlevania games! As much as I love the classic format (especially Rondo and IV), SotN marked the peak of the series along with the sorrow games and probably Ecclesia.
I really wish Bloodlines would end up on the VC, it's the only one I'm missing...