The Contra and CV games seem to be in release order so far. So for CV that would mean games post 4, so no Simon's Quest, Adventure and Vampire Killer, Haunted Castle (which is already taken in the arcade collection anyway). Fingers crossed that the next 3 CV picks are Chronicles, Rondo and Bloodlines, bonus if the last one is Rebirth. Between those 4 games and the ones already in the package, it'd be a collection of all the good Classicvanias. I honestly hope they don't include Symphony and the handheld metroidvanias with the idea of a second collection just for them, because if those are in the running then a lot of good games will be left out from both CV types.
We need more than 8 games in the collection. You need the first 3 NES games, Super, Rondo of Blood, Symphony of the Night, Aria of Sorrow, and Order of Ecclasia to hit the high notes - but Bloodlines, Circle of the Moon, 64, Dawn of Sorrow, and Portrait of Ruin are all excellent games that deserve more attention. I think we can safely ignore the GB, PS2, and digital-only games.
Making 2 collections would be the better choice, with this first one focusing on classic style CV. Rondo, Chronicles, Bloodlines, Rebirth. Those are the picks to make for the last 4 slots. Then the second collection can be another 8 games, those being the metroidvanias. Symphony and the 6 handhelds+throw in something else.
I'd also say bin CV2, that game is not only poor and blatantly unfinished, but also really doesn't make sense as a sequel if you played the NES CV1. It's a followup to the MSX version of CV1, which had different gameplay elements that return in CV2. Ironically the real CV2 to CV on NES is CV3. The numbering really messes things up, especially when you realise the japanese names for the games aren't numbered, that a localisation thing.