My mom designs and contracts homes so I may be able to assist you in this area. Have you thought of a contemporary looking with a classic cross over? Really depends what your tight location looks like, but you could utilize crown molding, white, granite, marble, and stainless steel to pull off an interesting look. It takes a ton of money to pulls off considering the length of crown molding, but does pay off. You could also shoot for very open, contempary look with more of a parcel feel to the additional rooms. Really works with you proximity to the beach. If I knew more about your tastes I could help you more.