lsh,
Debian is the distro probably most closely associated with GNU.
It's very easy to maintain once you have it installed. There's no company associated with it, so whatever you get is thanks to debian hackers.
Some think of it as the "purist's distro".
Regarding your question about support for your particular wireless pci card: Linux is Linux. A distro such as Redhat might support it out-of-the-box (that is to say, the driver might already be compiled into/along with the stock (and possibly rather large) RH kernel). With Debian, it may or may not be -- but it's not too too much trouble to configure and build your own kernel.
You might head over to
www.osnews.com and search for "debian" there. Also look in their Linux forum.