im thinking about buying a new ipod however i want to be clear on certain things. i would like to have the ipod play through my car stereo system and any stereo system anywhere really. all i need for this is this... http://store.apple.com/1-800-MY-APP...q4E0UtdHYqp27Ea12jPY1QtJvE/220.127.116.11.18.104.22.168.0 right? that i trip will allow me to do this? also in order for it to recieve juice in the car i would have to get this... http://store.apple.com/1-800-MY-APP...q4E0UtdHYqp27Ea12jPY1QtJvE/22.214.171.124.126.96.36.199.0 correct? i plan on getting the 20GB version. this one comes with the dock. im not understanding what the dock is conversly ment for. i mean i understand its direct function... that which is stated on the site... but it seems some ascessories may only work with the dock or something. i am not clear on this. thanks.