From what I understand the difference between network ready and Wireless would be for the setup from default. On a wireless printer you may need to set up the wireless network card on the printer to your network. I.E. static or DHCP. the network ready ones are typically setup with with a default DHCP configuration.
for a Review on that printer checkhttp://reviews.cnet.com/multifunction-devi...2.html?hhTest=1
This printer looks like a Good one I have to admit. Pretty much all your getting different than any other simular printer would be the wireless ability. I believe the machine also allows for wired in case you find issues with it.
Things to think about when purchasing a printer would be
Does the printer fit your needs.
Service plan/ warranty.
Cost per page.
and footprint. footprint being how much physical space will the unit take up.