Personally I wouldn't recommend anyone rely on wireless-only solutions for any home.
I am a professional AV installer. I see people who are either planning a major refurb and considering a structured cable solution, or I see people who dismissed the idea and are now running in to problems because wireless doesn't meet their needs for one reason or another. In short, you can't beat a bit of copper.
Structured cabling is where we consider all the applications likely to require hard-wired connections and install cable networks for each. But unless you are planing to have or add centralised lighting control, telephony with gate access, advanced heating, ventillation & air con (HVAC), blinds control, door locks and room access, CCTV and a myriad of other applications then it's pointless flooding the house with all that copper.
In most cases the requirement for cabling falls in to a couple of distinct categories. These are 1) data networking 2) distributing AV over CAT cable.
Data networking is straightforward enough: Put network points where you are likely to need connection to equipment then wire back to a central point where you install an appropriately sized switch and connect in your broadband service. 100meg and gigabit networking will handle distributing HD movie data files to several locations at once.
Distributing AV over CAT cable should be done with a separate network of cables. 2xCAT6 to each watching/listening point is a reasonable plan. On each endyou would connect a device called a Balun. This converts and AV signal in to something that can be transmitted by a single- or by a pair-of CAT6 cables. This is nothing to do with data networking and these cables should not be connected to a data network switch.
Optical has been mentioned. If you are a lottery winner and money is no object then ask your contractor to install fibre. For the rest of us fibre is so ridiculously OTT for domestic networking that it's just not a serious consideration once the costs for doing it start to roll in.
If you want to read more about the pros and cons of copper vs fibre then have a look
at this thread
Just to add in a point.... Someone in that thread suggested the best way to future proof any installation isn't to try to add all conceivable cables at install. Instead, simply make sure that one installs large enough service ducts that cable can be added or changed easily in the future. That's a great piece of thinking.