GRW, don't wait until you are "done" with the site...
...or you will be waiting forever. As soon as you get the look and feel and one or two main sections done, let us in on the secret... if you are getting good feedback from visitors, your energy level will be a lot higher, too. Forget six months; you've set yourself up for a lifetime job!
I say we take off and nuke the site from orbit... it's the only way to be sure.