Personally I would release every CV title, both English and Japanese versions, into a single compilation. It would be all the games from the classic series, the IGAvania series, as well games made during IGA's time that he wasn't part of. The only ones I'd leave out are the slot games as those to me aren't castlevania. An extra disc would be for all the extra stuff (artwork, storyboard, etc.). And another set of discs containing the soundtracks of all the games plus enhanced versions of older tracks from the Gameboy, Advance, NES, SNES, and Genesis titles. It would be a CV fan smorgasbord. The only other games I'd leave out would be the Mercurysteam titles.