Funny story...so one day I'm in Borders and see that they have the 4-disc box set for sale. I love the movies so I buy the set. I get home, open it up, and find that someone took out the original DVDs and replaced them with blank CD-Rs. So now I'm thinking to myself, "Great, there's no way Borders is going to believe me." I gave it a shot anyway, asked to speak with the manager, and explained what happened. He actually believed me -- I was completely shocked. They exchanged it without hassle, and even opened it to make sure the new one was legit.
Borders +1
As far as the movies, 4 is definitely my favorite. After that, 1 > 3 > 2.