Run cat6 and maybe a 22/4 alarm wire (in case you can’t use PoE power) to a few locations where you might want a tablet. Don’t forget the doorbell. Home run some cat6 there too, don’t let the electrician run it directly to the dinger. Cameras? A lot easier wire for those now. While you’re running that alarm wire, run it to your windows and doors and keypad locations. Wired security is far superior, and you can add IP interface to major brands (like DSC or Honeywell), or find a fancier brain box. If you end up not using it, not much money lost. Might as well add a cat6 to the keypad too. Just in case. Add smurf tube to major locations like TVs, equipment rack, or wherever you might find yourself very sad if you need to add fiber, or something else unforeseen. Pre-wire for a pair of ceiling speakers in various rooms. You can figure out the speakers and amplification etc later. Maybe wire for an in-wall sub in master bed and great room? Or at least some 75-ohm coax near a corner so you can hook up a powered sub later.