Hi

> I need to allow my users to do a full text search of the contents of
> the documents, a text search of each field of meta-data, and obey the
> security settings stored in the database.

I have no experience of this personally, but a moment with the big G
gave me this for your option 4:
http://www.ibphoenix.com/main.nfs?a=ibphoenix&page=ibp_dotlucene

Regards
Gareth Marshall