Jonathan, I I have had the very best luck with Avast. (I've purposely caroused some of the back alleys of the internet on the rare occasion just to see what it would do. It did protect my computer very well!) It has very strong heuristics and the latest version has added a sandbox feature that gives extra protection when used. Check out Avast here. That way you have something to compare with MSE and the NOD32 to. I think that you know better than to go the AVG route! :p

Hope this helps!

Message: 1
Date: Tue, 26 Jul 2011 13:52:30 -0500
From: Jonathan Hutchins <hutchins@tarcanfel.org>
To: "KCLUG (E-mail)" <kclug@kclug.org>
Subject: Anti-Virus
Message-ID: <201107261352.30479.hutchins@tarcanfel.org>
Content-Type: text/plain; CHARSET=US-ASCII

Is Microsoft Security Essentials adequate protection for small office systems
behind a dd-wrt router?

Freedom means you are free to be responsible ~ Russell Means 'Free to be Responsible' Speech: http://www.russellmeansfreedom.com/2009/free-to-be-responsible-a-russell-means-speech/

If you talk to the animals they will talk with you and you will know each other.
If you do not talk to them you will not know them, and what you do not know

you will fear.
What one fears one destroys. ~ Chief Dan George: http://www.indigenouspeople.net/dangeorg.htm

Everything the Power of the World does is done in a circle. ~ Black Elk, Oglala Lakota Holy Man: http://en.wikiquote.org/wiki/Black_Elk