All quality decks have a mem wire. Either Red or Yellow it varies in some models.
Pioneer have some good decks, because new models are coming in now, you should have no probs finding a Pioneer, Kenwood or Sony deck etc, with detach face and plenty of features around the $180-$250 mark. I know we have plenty, and im sure other AutoBarn stores do as well. Go see them in Melbourne and get a good deal.
Nothing beats the sound of a V8