I'm not upgrading all my dvRAB, just a few.
I was thinking of upgrading to the blu ray of Fight Club, but heard the only AMAZING improvement is the sound and I don't have a sound set up to really make use of that. So sticking with my extras packed one I have now on dvd.
I will be buying most films I want that I don't have on blu ray instead of dvd from now on though, unless it's something that's not avaliable, or something like a drama where I'd rather pay a lot less for the dvd instead.
I would have thought Titanic, and the remake of King Kong(if that's the one you meant) would indeed look wonderful on blu ray compared to dvd.
I'm sure someone will be able to put a link up, but there are sites that compare blu ray films to dvd in screen caps, to show you the difference as well as photos can.
Or type in google, Titanic blu ray and dvd comparison. Something like that.