oh gee that is a hard question....I would keep the Wyandottes because I am really enjoying them and there is alot of color variaty in the breed.
The other breeds that caught my eye would through me out of the keeping 2 breeds if I go that way. (example: Barnevelder, Crevacours, Orpingtons, Americauna, Silkie, Polish...)
Right now I just have the Wyandottes.