I'm looking for a decent search engine for my site.
It needs to be PHP-based.
I've tried SiteSearch Pro & Zoom, which seem ok at first sight, but I'm wondering if there are other good ones out there.

These are the main features I'm looking for:

* Fully customizable output
* Smart technology (if you type "grphic" the engine should search for graphic)
* Advanced loggings
* Negative file types, words, folders
* Database-less would be cool
* Stand-alone installation on our webserver

Thanks a bunch!