Here is the scenario. Right now this is on my test network.

Windows Server 2003 R2 running a native AD domain. A Linksys WAP54G
ver. 3 access point. I need a secure wireless network. I need all
traffic encrypted as well as restricting access ONLY to those with a
domain login (and possibly restricting only to known MAC addresses).

I'm assuming that I'll be using a RADIUS server of some sort. I have
IAS running on the 2003R2 box, as well at cert services.

What type of authentication do I need to enable on the AP, and how do I
set it up on the domain? I've established a shared secret and all of
that business, but I'd kind of like to start from scratch and here some
of your ideas and suggestions.

If I should just go with some 3rd party software, that is fine to
suggest as well. I'd like to stay away from buying Cisco equipment or
software, simply because of budgetary constraints. Linksys is cheap,
and I think in the end, it can provide everything we need.

Thanks
Brandon Riffel