Welcome to the boards and the world of automation...
jaxbri you have a great advantage over most, your working with new construction. As steven r indicated now is the time to add all that extra cable. Some of the things you need to think about is phase coupling your power coming into the house, if you want to add cameras at some point wired cams produce better results over wireless so you could run cat 5 or cat 6 cables to accommodate them (6 conductor phone cable will work for cams as well). If you plan on using wall mount X10 switches and receptacles make sure your work boxes have neutral conductors passing through them and that you use the bigger cubic inch capacity boxes as you can for the application. If you do add cameras and plan on using the robotic Pan-n-Tilt (Ninja) plan your camera locations and an electrical outlet close by to plug its power pack into.
When running cables avoid running cat5 or phone type cable parallel with power cables. Cat6 cable has a shield in it but I have not run any along side power cables to know if its a problem.
Come here often, search for answers to any of your questions and if you don't find the answer ask and someone will provide some input.
(http://www.bdshost.com/X10/lpup.gif)---(http://www.bdshost.com/X10/lpup.gif)---(http://www.bdshost.com/X10/lpup.gif)---(http://www.bdshost.com/X10/lpup.gif)---(http://www.bdshost.com/X10/lpup.gif)----KDR