For this project we used Ben Moore Advance done in a pearl finish. Its a water-based alkyd, very durable but takes a very long time to dry.
Although it would have been nice to paint the doors using a lacquer its not to practical if the customer is doing the rest of the trim (casing and baseboards) themselves. You need a system that both you can the customer can apply – Ben Moore Advance or Sherwin Williams Pro Classic are good for this – the down side, as i already mentioned – its take too long to dry and that eats up shop resources.