Lets get the preliminary information out of the way.
Location: Alberta, Canada
Router brand: Asus RT-N56U
Network connection type: Wireless - WPA2 Personal - Internal Adaptor
NAT type open? Unknown
W: 0000 - 0000
X: 8000 - 0011
Y: 0000 - 0000
Z: 0000 - 0000
ID: 0000 - 0009
Internet Type: Cable
Error Message shown on screen: Varies from the "Are you sure you entered the passcode correctly" to "Are you sure you selected the correct wireless network" up until "Visit xbox.com for more help"
More info: I have ran through the entire self help troubleshoot guide provided. I have hooked up the Xbox to the router via hard wire and it connects successfully. I have returned my original Xbox to the retail store and tried with a second Xbox, still no dice.
Any help would be grand, thanks!