What are the best server auditing/monitoring tools to track changes, check traffic, etc.?

What are the best tools to monitor inbound/outbound traffic on a Windows 2003 web server?  What about a tool that tracks changes to files including the username of the last 10 people to modify? What about a tool that notifies the webmaster when hack attempts are suspected? In short, I need tools that will report the status of my web server.
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SysExpertConnect With a Mentor Commented:
SOunds like you need an IDS system ( intrusion detection ).

Plenty of options.

I hope this helps !

rotantAuthor Commented:
What are the least expensive/most effective IDS systems for Windows 2003 server? SQL server?
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