Thanks so much, both of you! I haven't bought a wig off Arda before, though I've heard of it, so I didn't think to check there.
I'll expand on that and say if you go that way, use the Magnum. It's thick enough and if you want to make the "ears" out of the hair like the ebay listing, you have more then enough wig hair to work with there.
Any idea if the Magnum Long has the same kind of thickness? The Magnum looks a bit short for what I want but being able to rough up/spike the wig in general is going to be necessary.