Not on the list, but fullblacks are my pick. They are also on the uppper ends of guppy prices. Alot of the Thai/Japanese medusa strains also go for ALOT of money.
I like the blue Moscows as well, I envy you in this endeavor!! I am limited on tanks due to space right now, but I still go to the livebearer section on AB and daydream sometimes....lol