I have a modest, but growing DVD collection. All DVDs I buy myself I really enjoy and cheerish... my favorite movies... or movies about my favorite things.
Most of my collection is TV shows. I own all 3 currently available volumes of Seinfeld dvds. The first 2 seasons of Simpsons (I have been meaning to collect this more... up to at least season 9 or so when I felt the show started to have a lower quality to it) Space Ghost Coast to Coast Volumes 1 and 2 (going to get 3 soon I think). Plus my favorite one, an obscure yet very funny show, Home Movies season 1.
The few actual movies I own are my favorite movies... What About Bob, Lord of the Rings trilogy, This is Spinal Tap and UHF.
I also own a documentary on TMBG, titled Gigantic:A tale of Two Johns... and a Weird Al Concert DVD.
I like the DVD medium, the cheapness in manufacturing costs lets me collect more Niche movies and shows that in other formats wouldn't have even bothered to produce.