Given the rights to do so, which Filmation variants (a) would you like to see, and (b) do you think they would do?

Overall, after all, they vary from relatively mild differences (e.g., He-Man) to the virtually unrecognisable (e.g., Clawful), and based on what Mattel have said about 200X variants, the only the latter group would be assured of being done at some point.