Komposer could be just what you're looking for. I haven't tried it out myself
yet as I am new to Ubuntu and am sticking with Dreamweaver on XP for the time
being, since I look after a larger site for my employer. Komposer seems to
have a good interface and WYSIWYG.
Good luck and, if you try it out, let us know how you got on with it as I would
like to consider switching at some time in the future.