I'm a big time horror buff. I dig the Hellraiser movies, but they definitely went to hell (no pun intended). They got buried with crappy sequels and they just kept trying to push it. Now, they're remaking the movies and no, Doug Bradley is not going to be returning as Pinhead. Anyways...
For me, I would probably have to say that Hellraiser III: Hell on Earth was my favorite one. I don't know why, but I've always really dug that one. Maybe because there was a slew of cenobites and we got to watch them tear up a city?