As above. I used CL2 wire as well. I believe the information at the time was that CL2 grade wires were resistant to heat and did not conduct a fire along the wiring inside the walls. Building codes in some areas may require them, and if it's new construction, will (probably) have to pass an...
It's easier and cheaper to wire while building before the drywall is up. I'd wire for everything-if you use less, you're not out much. Put the ending into juntion boxes with excess and cover it with a wall plate if you don't use it. 14 gauge should be sufficient-you can get it by the roll from...