I'll gladly re-buy this on Wii U! I'm one of those weird ones that actually likes it as much if not more than Rondo. 
I'm with you, Gecko! I prefer Dracula X to Rondo of Blood. I've still got a copy and played through it just a few months ago...but it's such a great pick-up-and-play Castlevania title with just enough depth and strategy without feeling unfocused or meandering (which is a weakness for me of the more ambitious Rondo). I think I'll have to get DX eventually for Wii U when I inevitably get a Wii U. (I would say that Dracula X SNES was one of the games that solidified me as a Castlevania fan. I liked II-IV a lot, but it was something about Dracula X that really hooked me).
I don't think I'll get Aria...I just never found it to have tons of replay value, and I still have the GBA cart.
But...the deal-breaker would be BLOODLINES, which I don't have access to and have only played a handful of times many years ago (and quite enjoyed). Can we PLEASE get Bloodlines on VC?! (Oh, and Contra: Hard Corps, too, please!) Anyway, Dracula X on VC is beautiful, as that means this underrated game will FINALLY be preserved on some official level. I actually wrote a letter to Konami about 2 years ago asking for some of these titles, and they said they'd pass it along and consider it. Doubt I affected anything, but it's still awesome to see this happen!