Anything better than 10 guage Romex?

Some have used Belden 83803. 12 ga, tinned, shielded, teflon insulated plenum wire. Not solid core and stiff. Parts Express.

You can use 10 ga BX wire. It has a metal jacket, you have to use metal outlet boxes. Comes in the same configuration as romex. I used it for my balanced power runs. Much harder to put in place though.

10ga is about the thickest you can still attach to a power receptacle and can be used for up to 30amps.

For Gods' sake DONT Have a male hot. DONT

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