We were referred to Cisco by LinkSys.
We have at least two XBox 360's in our home at any given time. That number has the potential to increase at times. We either need to pay for a Static IP or purchase a wireless-capable router that will let us handle multiple XBoxes, and computers. I need to know which model will work best for us, and I need to price to see which option--router, or static IP--will work best for us. The router needs to support UPnP forwarding we were told.
We will also be adding fax machine, etc. to our networked equipment in the future.
I would actually suggest you get a linksys wireless router for this :). If you have adsl get one with adsl interface, else get the ethernet sometime called broadband version.
It will do all the things you mentioned above.
These are easier to configure and more economical than cisco, that is for commercial or home/office use.
In contrast the cisco (your model would be an 85xW or 87xW), is more difficult to configure and can be frustrating for an home user that doesn't need any of cisco many many features.
This said if you have question, feel free to ask here!
hope this helps, please rate post if it does!