Ideally, this is what I would want.
-Castlevania
-Simon's Quest
-Dracula's Curse (ENG and JP versions)
-Super Castlevania IV
-Rondo of Blood
-Chronicles
-Bloodlines
-Adventure Rebirth
-SotN
-Aria of Sorrow
-one of the DS titles, preferably Dawn of Sorrow or Order of Ecclesia
What I think would be great is if they put out two separate collections for Classic Castlevanias and Metroidvanias in a volume 1 and 2 deal.
If this turns out to be good I really hope it's coming to Switch, I'll be disappointed if it's Sony exclusive again. I have a PS4, but Nintendo needs a Castlevania.