Must Have on Blu-rays

[CCSchoch]

I am new to the world of Bluray. I have 100's of DVD's and do not really want to replace all of them w/ Blu Ray unless it's a must have.

Curious, what are some of the MUST HAVE on BluRays, meaning, the sound/picture quality on DVD doesn't hold a candle to the Blu-Ray.

Here's the BluRays I have already, Avatar, StarTrek, Batman - Dark Knight, Underworld (ROTL), Jack Johnson Concert Film.

Also, this brings up another question. I have an Oppo BDP-80 player. I just got the Dark Knight and popped it in...it takes a LOOONG time to load and sometimes I have to turn off the Oppo and turn it back on to load. Is the Dark Knight Blu-Ray known to take an extra long time? Got the BluRay off Ebay (it was new supposedly) and not sure if it's a bad disc or what.


Thanks!!!!