If I were just starting, there are two morphs I think every breeding program should have: Fire and Pied. The Fire just does incredible things for combos (plus the black eyed leucy is awesome). The Pied has about as close to "Universal appeal" as any morph out there.
That said, the third choice is debatable-either a pastel or some kind of albino (Preferably Lavendar, but caramel or normal albino are also good-depends on your budget).