I've played the Ocean Course but not Harbourtown. When I played the Ocean Course years ago, it was probably the best public-access, seaside course in the U.S. (it was pre-Bandon Dunes Resort). So, the cost didn't bother me that much because it not only offered good golf, it offered a unique experience. I enjoyed the course, although it was extremely difficult. I understand it's been softened a bit since then and been changed so there are more ocean views. I'd love to see the changes. I also thoroughly enjoyed Kiawah--very laid back and great beaches.
Like I said, I haven't played Harbourtown, but I wonder whether it offers the same level of golf experience that the Ocean Course does. I kind of doubt it. It looks like a fun, strategic course which was ahead of its time, but now doesn't look all that different from many resort courses. I know it's a very good course, but I personally want something above and beyond that for $200-$300. I'd certainly play Harbourtown if in the area but have no plans to go out of my way to play it.