Why do you need a wireless network if you're going through cable? If you have your house for cable, you can hook up a computer in each room that has a connection. True you may be out a modem but build slowly. Wireless is pretty much straight forward. To set up a wireless network without the neighbors tapping in you are going to have to read the directions.
We only have one cable connection in the house. I know we're probably out of the norm there as well, but we don't exactly have the Taj Mahal sizewise and we have one cable-wired TV, in the living room (kids have a TV in their bedroom, but it's only used for DVDs and games). Our computer is in a different room from the cable connection and we're inclined to keep it there because it suits our purposes for it to be there. I figure Comcast will split the line and give us another connection there. I just figured wireless would be the best way for my wife to be in another room and on the Internet with her laptop.
Did you forget that each computer would need a CABLE MODEM?
why would want to run cable wire everywhere in the house?