You're insane! Well, I don't think you need an external hard drive for your laptop. First of all, do you really want to walk around with that? Second, are you going to be using that much hard drive space on your laptop? I think it's better to go with a dvd burner. Very useful and you can carry cd's instead of an external HD. Also you can get a USB Flash drive. Smaller and you can get nice big size. I don't mind making you DVDR copies but are you really going to want to see old series or stuff you've seen already so desperately that you couldn't wait till monday?
Crazy