Used to buy many, now buy few.

Basically, anything I plan to watch more than once. This means anything by Christopher Nolan, the LotR trilogy, and quite possibly the Avengers if it lives up to my expectations. I've also enjoyed the new Bond movies and will likely CI sider getting the new one on Blu-Ray if it's any good. I've gotten decent mileage out of the last two.

I think my main problem is I just don't watch too many movies these days, but there are some movies I like that I will re-watch (I've seen Inception 4 times since I got it and Memento countless times).