The Belden 83803 - it is spec'd for smoke and fire alarms because the shielding allows it to survive a fire. Very quiet - I used it in one of my apartments when I installed 20-amp dedicated lines for monoblocks. Here is the Belden spec sheet:
www.belden.com/techdatas/metric/83803.pdf
www.belden.com/techdatas/metric/83803.pdf