I'm in the process of a build now, and theres a lot of great ideas here in this thread already. My house is 1650 sq ft on main floor with a full basement which will have the laundry room, extra bathroom, utility room, storage room, extra bedroom and a tv room. I have a attached garage thats 24x22, and another 26x18 in the back yard. I am no putting in any land line phone, internet cabling, or cable for tv's. Seems like a waste of time now, with everything going wireless. My gf and I both just use iphones, and use wireless internet and smart tv's. Everything we watch on tv is in the itunes store or netflix
. My exterior walls are 2x6. For heat I am using a 3.5 ton air to air heat pump with 15kW aux heating source, and will also have a 50,000 btu propane fireplace in the living room. Make sure you have lots of outlets in the walls, and go with LED lighting. Theres so many ways to customize everything now too, basically if you can think it, it can be done.