this is one of the very few audio things that you must get the auto-grade wire.
the home depot '0' gauge is meant to carry ac voltage, and is never meant for dc, and would be imposible to run anywhere.
auto grade also has more conductors that will help carry the power farther, and is easier to run because it is more flexible.
also, make sure that you get oxygen free copper wire, and not the new junk called cca, or copper coated aluminum-- the only advantage to it is that it costs less when you buy it.
with the install that you are doing, it might not hurt to have 2 or 3 runs of 0 gauge just to make sure that you are never in a situation where the wire gets warm.