New (old) house + sledgehammer - wiringa

[Vytalis]

So, I should be standing in a new house (built well in the early 1960s) soon and the interior needs gutting completely. So I want to take the chance to hardwire decent quality video, audio and (possibly) smarthome stuff in. Where do I (or would you) start? This is the final house so we'll be in it until the kids leave in 25-30 years, so quality without being insane on price and an eye for upgradeability is the way to go IMHO.