apt-get defaults for keeping my system stable and secure?

[john]

Hi all,

This sounds like a pretty stupid question but that's never stopped me before ;-)

I am running a web-server with Debian etch on it. I run apt-get update
about once a week to figure out what's new. I also subscribe to the
debian security list and I only want to patch security problems. Is it
sufficient/best practice to have ONLY the following lines in
sources.list:

deb http://security.debian.org/ etch/updates main contrib
deb-src http://security.debian.org/ etch/updates main contrib

Thanks for your advice!

John