Setting up secure wireless broadband router

I have just got a Linksys wireless-G Broadband Router and I want to make sure its as secure as can be.

I have actually turned off the wireless part bacause my wife hardly ever uses her laptop at home.

I set the encryption for WEP 128bit. I changed the Default name of it. Gave it a name and gave it a good long mixed password.

I have "enabled" a policy, and entered the IP and MAC of our computers for 24/7 use. I have limited the router to a max of 2 IP's at a time (X for mine and X+1 for hers).

But on my old D-Link router there was options that explicitly allowed or denied IP's and MAC's. So that I had the old one set up to ONLY allow our MAC's to use the router and deny everything else. This WRT54G doesnt have anything that I can see that says it will deny anything other then our computers and am wondering if setting up this "policy" to "allow" and entering out MAC's will deny everything else?

I basically want to make sure that the router will deny anything that is not the wifes or my computer.

Also should I change the default IP address of the router? Does that help for security? Is there anything else I need to do that will make it more secure? Not that Im even worried but its better safe then sorry.