I have a couple of friends who are serious movie collectors and they're both sitting at around 500 DVD's/BD's each. My friend Steven just let Cathie and I borrow Rogue One which ended up to be a wonderful film. It's funny, Steven mostly collects Anime while my other movie collector friend Scott only wants films in his library that feature women he considers attractive. Let's just say that in a some ways he's a second-rate Mr. Skin.
It's always tough to pick 5 movies as favorites but these are towards the top of my list.
Star Wars: Episode IV - A New Hope
The Silence of the Lambs
"All truth passes through three stages. First, it is ridiculed. Second, it is violently opposed. Third, it is accepted as being self-evident." - Arthur Schopenhauer