Wow, that's a tough choice, but I'd go with lighting package. Leatherette isn't much of a downgrade from the rather shabby BMW leather (and apparently wears much better--although I've heard that it doesn't breath very well, which might be a concern in Hawaii). The stock HiFi is pretty awesome (I listen to lots of music, and I think the stock system is great). PDC is nice feature, but I agree with others who say that lighting really adds a great look to car, and the lights are pretty amazing on night roads. The halo rings are so distinctively BMW that it seems a shame to miss out on them.
Good luck with your decision!