I was thinking to buy XBox 360, but I dont want to be too addicted nor spend too much money. So I wonder to buy XBox 360 Arcade(Jasper). But I heard some info that Xbox 360 Arcade can't save game and come with 256mb internal memory, not hard disk like elite one.. Is it possible to change it into hard disk so I can get more space? And does arcade have HD cable slot? Thx~ 