In reply to jkarran: Hi
I floodwired with double screened cat 6 and speaker cables. The cat 6 takes care of the multi channel / multi room audio visual system and routes back to centrally located servers and sources. It also handles, network distribution (wifi struggles with the demand of several people playing PC games at the same time), security cameras, access control and phones (although I prefer and use rf phones instead)
Separately I floodwired with cat 5 and radial mains supplies back to a central lighting / power system meaning that I could install programmable mood lighting and scene setting. This also allows individual control of light fittings and socket outlets so that you can introduce a home control system, particularly if you link it with your thermostats, boiler and light sensitive switches / PIRs
In my view the only time to do this is when the plaster is off the walls, fitting the cable is cheap, it's what goes on the ends that costs and that can be added later.
You can get various bits and bobs that use wifi but if you want a system that fully hangs together it's still better and cheaper to go with cable (as well as having better bandwidth). You can do quite a bit with an ipad and Apple TV / airport express but the only place I use wifi is to connect my controllers to the system.
I hope this helps.