Got a setup question that I want to make sure I have right in my head that this will work. Want to run cable internet through the AEBS and use one of the wired LAN connections to my DirecTV HD-DVR. In two of the bedrooms I want to run use an Airport Express in each to 1.) extend the wireless network and 2.) direct connect DirecTV boxes in each room to utilize the Whole Home DVR service they have. This should work, right? Also, if there is a printer connected to a USB ports on the Express it would share across the whole network, correct?