1/0 for big 3. I'd personally go with Karma SS RCAs.
Don't apologize for asking questions You're smart for asking.
I know I need 1/0 for the Big 3, but should I get the power/ground kind for it or just ground or power?
I don't understand what you're asking. Power can be used for ground, and ground can be used for power. The ONLY difference is the color of the jacket (which doesn't matter). For the power you're potentially running, id get Kolossus Fleks