steindachneri are some of the prettiest geckos I have seen and galaetus are certainly cool. I'm not even convinced that if you crossed vittatus with wiru or furcosus the offspring would be sterile. Especially depending on the population locations. D.'vittatus' group is a right mess, I think granierensis are at least pretty sorted now though. I reckon give vittatus 10 more years and then bring in some known localities to keep pure, would be the ideal situation.