Ok, well I have internet and cable already in the house and would like to 2 tv's (hdtv's) 2 xbox 360's and a computer to the 1 computer upstairs and other tvs in the house. What is the best way to do this?

Can you be a little more specific on what you are trying to do. Do you just want to network things together? Are you trying to implement a media center set up? Etc...