title says it all. this will be my primary machine. i went from a 15 mbp so i never needed an external. but now going to this 11", i might decide to make it sort of a desktop set up with an external, apple keyboard/trackpad, and speakers. its quite an investment but it will be my only machine, i dont own an ipad, and the other desktop in my house is my dads. so if you use an external, what kind do you use?