Trash php-nuke. It's old and outdated by now. I think it's right, as mrsx says, to start with a new cms. Maybe vB, Seditio, Invision or some of the new script's out there. There's alot to choose from, i can tell.

Regarding security, it usually causes more problems than it helps. Somone will still find a way to "crack" it anyway. Just give it up...

The big web design sites out there figured this out, and most of them don't do much about security. They just put a copyright on it and a link to their site. The things will be on warez sites, of course, but it will still work as advertisment. And for those who want to get a "real copy" of it, will come here and buy it.

Take extremepixels.com as an example. Their stuff is allover every warez site out there, but still, he sells alot, because the site is well known. And i think, thats alot because of the warez sites.

These are my thoughts, and i know alot people don't think the same.

From my experience, there will always be someone who crack it, no matter how much security you got.