[Rathji]

Cat6 to most of the rooms, probably double (or more) drops to anywhere there is a TV planned. The more costly approach is to run conduit to each of these locations, but gives you extreme flexibility lateron. Don't bother running HDMI, as it can be run over cat5 cabling, just make sure you account for it.

Proper backing to wall mount TVs, and conduit to run cables from components to those TVs.

Ceiling fans, either get them installed right away, or ensure that wiring and proper mounting area is in place to support them in the future.

Wiring in sound in at least the great/living room, but ideally throughout the common areas of the house and garage.

Upstairs laundry is $$

9 foot or vaulted ceilings where possible.

Washrooms on every level, including at least a shower in basement (if developed).

Walk in closets in all the rooms, possibly a his/hers in the master.

Big walk in shower in the Ensuite. My wife really likes the double sinks we have, but I find it really pointless.

We have double sinks in the main bathroom that the kids use, plus a sliding door to separate the shower/toilet and the rest of the bathrooms. At first I wasn't happy with the idea, but when my kids are older, it will be a nice bonus in the morning.

Ensure your natural gas pipe is large enough to support potential stove, BBQ and fireplace.

Run conduit from your attic to your basement. You never know when you will want to run some cables for security cameras, wireless access points, or even an OTA antenna

I really like the idea of putting each room on its own circuit, and the 220 service into the garage, and USB ports built into the wall plugs.