It all depends on your current needs and what you are expecting to want to do down the road. My friends that took the time to plan wiring for their new construction ran wiring terminating in a closet in his office (patch panel to switch):
gigabit CAT6 wiring to every room, specifically to areas conducive to a desks and wall-mounting sites for televisions
dual 110 power outlets on every wall (in some places 2 sets - retro'd some including the kitchen, the living room and bedrooms with USB power available)
wireless router and modem are in a wall-mounted network rack in his closet with cooling system
2 wireless access points to create a signal umbrella for full bar signal in all areas of the house including the basement and back deck
speaker cabling to ceiling mounted speakers in his office, master bedroom, living room, kitchen, back deck connected to a receiver in that closet
Just a couple of recommendations based on what I has seen work well