Samba - security setup

I'm looking for suggestions on how to setup security on my Linux box.  I'm going to have NT/Linux machines on my network.  Is it better to have NT be a domain controller and handle security or Linux?  Are there GUI wrappers around the Samba setup available (doing it via command line truely sucks).  I want one point of security admin (1 place to add users and change passwords) for my whole Linux/NT network.  This is for a high volume web site, so security is important.
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For the "one point setup" the best way is to use a NT server to auth. the users.

GUI setup: Look at SWAT (web based) it is installed in most modern linux distros, just enable the service in /etc/inetd.conf and then connect to port 901 of the server (use root credentials to log on)

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