??? I am no networking specialist but I understand quite a bit, and have my own network with routers.
2 WAN IP's adresses are adresses that are available on the outside, you only want to do this for multiple proxy servers running on your connection.
If you want a Router that will handle 2 PC's, linksys BEFRSR41 is a rock solid cheap router. I have one of those, it broke after 4 years of hard work though, now im using cisco routers.