Router alternative
Instead of buying a router, you could do something else ... especially if you got down on that Staples deal w/the switch and the two ethernet cards. We just got a cable modem and have two computers here so in order to get both of them working off the one cable modem you simply ...
1) put two ethernet cards in one, one in all the others you wish to have connected
2) run the cable modem into the computer w/two NIC cards and then run the other NIC card out to the switch/hub
3) you can then run other computers into the switch/hub and set up a network on the computer the modem feeds into
Maybe that's more complex then you wanted to get, but it didn't cost me a dime since I used that Staples deal.