Creating the perfect balanced Imperial Fleet to take on any foe is a cool task.
In 1500 pts it is a question if you want a battleship and then what type of battleship is chosen.
So start there. IN is diverse. You can go with steamrollers, flankers, pincers, broadsiders, etc.
Eg
Emperor
2x gothic
2x Dominator
is a great core.
Retribution
2x Dictator
2x Lunar
as well
Vaaish his core setup is unique, good and cool as well.
LB = Launch bays.