Recommend a decent ferry route to France please?

Not interested in Dover - Calais, obviously.

Criteria: I don't want it to be more than about 5 hours crossing. I want it to cost no more than £150 total return, 2 adults, 1 infant and a car. The French harbour should be no more than 200k from St Pair sur-mer. Early morning crossing on the way back/afternoon crossing on the return preferred.

Thanks in advance.