If you are concerned about wiring, we should start there, especially since you are undecidied about cable TV or an antenna. If your walls are open, and you have easy access, I would run high-quality RG-6u coaxial cable from a central point in your house (like a panel in the attic) to each room where you want television. Use "F" fitting type wall plates to accomodate the cable, and try to run an even number of leads, since cable divides better when run in multiples of two. You can wire as many rooms as you like using this method. Be sure that you have AC power available where all the coax cables converge. When all the cables are brought to one point in the attic, determine how many total cables you have, and buy an appropriately-sized splitter to accomodate the cables ( 2-way, 4-way, 8 way etc) If you are planning to run multple cables ( 2 or more ), considder adding a 2-way cable TV amplifier in the line before running from your signal source ( TV antenna or cable)
I have successfully used splitter-amplifiers like the Channel Master CM341x series with up to 8 TV outlets. These devices have both splitter and amplifier built into one chassis, and are convenient, but, like all amplifiers, require AC power to operate. This system will work equally well with Cable TV or an external TV antenna.
If you are considering using multiple computers, you can use Wi-Fi easily enough, but you will get faster speeds and greater security if you run CAT-6 cable brought to the same single point in the attic, and use a good-quality router to distribute your internet needs. All cable is a pain to run once the walls are in, but easy to do if you are still in the construction phase, and have access to open walls and an electrical contractor.
http://www.channelmaster.comhttp://manuals.solidsignal.com/AntInstallGuide.pdf