I do really like the Bettas4all standard, and I think that that would be a reasonable place to breed toward. I prefer, and I think a lot of folks agree with me, a VT with a wider caudal than what you see on most pet shop fish. I have a grizzle boy with very nice form, IMO, unfortunately he has chronic bloat. Doesn't seem to bother him, but I'd be wary of breeding him.
Solstice - cellophane HM female