i don't know what else your planning on connecting, but 0/1, or 2 ga sounds like a bit overkill for a couple of media devices like the ps2, and xbox..
you can refer to this power chart for the proper wiring size you need:
now, the major reason for not installing a larger power wire then needed is the extra expense of the copper wire.. if this expense is fine with you, then it is perfectly fine to use 1/0 ga..
just do not use cca wire-- this is a new cheap wire type-- it stands for copper coated aluminum, and the wire must be larger to carry the same current as its copper equivalent. this wire also heats up quicker because of the aluminum..