powerhandling is the same with the copper coil as the stock one, the stock one is a round wire copper clad aluminum coil
from the thread on our forum explaining all of the options:
Copper coil (+$5) – The copper coil is a heavier coil and adds mass to the moving assembly. In comparison to the stock coil, or the flatwound coil, this has the smoothest transitions musically speaking. It is less likely to peak, and is a better overall sub for more Sound Quality based daily drivers.
We don't have a dual 1ohm option in copper yet.
Everything explained here:
http://www.soundsolutionsaudio.com/forum/index.php?showtopic=7156