If your looking to purchase a router the Linksys WRT54GL is a common piece of hardware around this forum, you will also have to bridge the modem then set your router for PPPoE
Also when setting up the router change the default username, / password, and setup wireless security WEP is OK, but WPA is far superior. That way you can keep out any unwanted visitors for using your wi-fi connection or getting into your router.
Linksys router from New Egg:
http://www.newegg.com/Product/Produc...82E16833124190