Not knowing what you want in a desktop experience it is hard to say what you want.
If you want the packages for media that Debian does not support then you may want;
deb http://www.deb-multimedia.org wheezy main non-free
deb-src http://www.deb-multimedia.org wheezy main non-free
Then again you may not.
One thing you may not be aware of is that you may also need the package;
without that my box will not boot to the desktop.
This is an older DEll so you may need that.
Happy to hear that MS is being replaced for you. I have a great fondness, myself, for MS. If they had not released Vista I could still be using their products. Now my wife and I do not allow their products in the house (have one friend with a MS phone that has learned to leave it in the car).
As another member here has in the sig "if it is not in the repo you don't need it or it doesn't exist".