Upon getting my iPad and being unable to stream much without huge wait times, I've decided to take the plunge and get an Airport Extreme. Well, it arrived today, but alas it seems that I need a modem and Ethernet cord! Now, in my defense, I've been using a router that is both a modem and a router for years -- and it connected straight to the cable jack, so I didn't know that most routers needed a separate modem unit and Ethernet cord! Any way, it's too late to head out now so I'm going to have to wait till tomorrow to stream my precious netflix -- but I want to get it right this time; so... I need an ethernet cord to connect the router and modem, right? The Modem/Router I've been using is called the SBG900 Wireless Surfboard Gateway. In my experience, the speeds have been dismal, but I should be able to use this as my modem -- right? Will it be slower than if I bought a separate modem? Does the modem even effect the speed of your internet or is that just the router? Anything else I should be made aware of? Thanks!