you can have good result with maya ocean, i did one not bad for a movie.
it can be a bit odd when you are very far or very close, or if you are on the top... but you can ad ramps in the displacements, blend few textures to break the synthetic look..
also you have an other solution to have a nice ocean in maya that's vue d'esprit. the last versions have a connection with maya, you can export your ocean and lighting in maya.
The results are not bad at all.
You can see some renders on vue website, you have quite the same through maya
good luck
Jaz