Right now we have a cable coming into the house to a 2 way splitter then one cable going the HDTV on the first floor and a cable going to the 2nd floor bedroom going to another 2way splitter for sdtv and Internet would I be able to swap the first 2 way splitter and install a 3 way then run the new cable from that to the new room? Which splitter should I use and can I buy a Scientific Atlanta 8300hdc (same cable box 1st floor HDTV uses) and use that with the new HDTV in the new room without any issues? Is there a better cable box I could use for HDTV that has dvr?