I have not heard the new Psvane CV-181, but I do use the black treasures and they are great tubes. On the contrary, I've been greatly dissapointed by the Psvane 845 and 12au7 tubes... have not met a Psvane I like yet...
The 300B black treasures are very nice as well and I have a quad of black treasure el34s in route to me... Psvanes... not so much, imo.