Setting debian default version in apt.conf
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This is a very clear and concise statement on how to achieve a mixed level Debian system, sorry but I forgot to get the URL this quote came from, and I can't find it again, if you have it, I'd like to properly atrribute it, but here is the information, which is quite clear:

:: Quote ::
I believe its not unusual to run mixed systems. It is indeed very
easy to do, though not necessarily obvious. The key is in the file:
(created by the root user if needed). Mine contains:

APT::Default-Release "stable";

and my /etc/apt/sources.list contains stable, testing, unstable, experimental and debian-multimedia. Because the default release is specified as "stable" I can run apt-get upgrade or even dist-upgrade and my system never adds or upgrades to packages from non-stable unless I explicitly choose to do so, either by apt-get install / or apt-get -t install i.e.
apt-get install perl/unstable
would attempt to install perl from unstable and meet any dependencies from stable while
apt-get -t unstable install perl
would install perl and any dependencies from unstable.

One line of text is all it takes.

Nice article here as well:
More on pinning here:

Also, as damentz notes, prior to this reset of default, you might want to do this:
:: Code ::
 in /etc/apt/preferences
 set testing to priority of 1001
like so:
Package: *
Pin: release a=testing
Pin-Priority: 1001

 then do apt-get dist-upgrade

and everything gets downgraded to testing.
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