Depends on how much work you can do and if you get the head surfaced or not. The head work is probably around 200. The gasket for the turbo cars is ~60 bucks, yours if probably similar. It would take a few hours to swap it. This would also be the time to do a timing belt if its (over)due. If you are paying someone to do it, it gets expensive
Its a good bit of labor, and you have to have some idea of what you are doing.