What factors into your decision when buying a certain Blu-ray Disc?

[Mou gaan dou]

I'm just wondering what factors into your decision when buying a certain Blu-ray Disc? There are some people on here who own 70-something BD's, and that's not a knock on them at all.

Obviously, PQ and the audio track plays a big part. Aside from that, what do you look for before buying one? Special features? What is it? Humor me.

For me,...I generally only buy the Blu-ray's that I have to have, although there have been a few exceptions. I'm 18 and I'm on a budget, so I don't go out and buy all the comedies and crap, although I'd like to.

I'm big on crime dramas, so if there's a good cop movie on Blu-ray, then I consider that a movie that I have to have in HD. I have some movies on SD DVD that are on Blu-ray, but on some of those I don't care about the picture quality, while there are some others that I'm willing to upgrade from SD to HD.

Just wondering here.