Well. My 20GB disk is just not enough (Who woulda thought? ) So I plan to buy a 500GB WD MyBook The one with Firewire 400, USB 2.0 and eSata. I'll be making this my itunes libary and will be watching movies and such from it. But with me having the cube, will I experience lag on anything? I'm sure the firewire 400 will be fast enough. But I was just wondering if anyone had any insight. Thanks in advance.