Looking for Advice

I got my aTv and use the ATV Flash so far everything is great.

We have 2 macbooks, so there is no fix machine at home that can carry our collection of movies (I am converting our dvds (over 150) to be able to see in teh atv and bring some in the laptop once in a blue moon.

We are looking for 2 things.

1.- How to make the ATV self-sufficient, so we do not need to use our laptops to sync movie
2.- What is the kind of drive I need for when I get the New ATV for our room?