It depends on what part you like most about your first two Genes there.
If you don't want to deal with heterozygous animals or a multi year plan, I'd look at Enchi or Black Pastel.
Enchi seems to lower the spackling on adult animals, while Black Pastel makes the deeper colors really shine and increase the spackling.
If you can swing it, a second banana gene is good too, as super bananas can be very pretty.
Otherwise all the suggestions above are solid. The Leopard suggestion would be a great one too.