Oh boy, where to start? So many reference DVDs so little time.

Here's my little list in no particular order
The Matrix -
When Neo pulls up along side the building in the helicopter and just wastes everything. Also the lobby shoot-out is a classic for any HT buff and the shooting sequence between Neo and Smith in the subway.
The Matrix Reloaded -
When Neo is flying really fast to go save Trinity.
The Matrix Revolutions -
The end battle scene between Neo and Smith is truly astonishing on the ears and eyes. As well as the scene where the machines invade Zion, WOW.
Gladiator -
The begining battle scene in DTS is absolutely insane.
The Fifth Element (of course) -
When Leeloo is being chased in the begining, some great LF effects in the soundtrack. As well as the cab chase scene.
U-571 -
Simply put, the scene where the depth charges are being dropped is easily the most demanding scene on any subwoofer, it has frequencies that drop below 20hz.
Apollo 13 -
Another woofer cooker that goes below 20hz in the opening scene.
The Fast and the Furious -
The entire movie sounds simply amazing, especially if you have the DTS version.
Saving Private Ryan -
Need I say more?
Finding Nemo (of course) -
Truly some of the most amazing colors ever seen in any movie.
Final Destination 2 -
The opening freeway pile up sounds and looks amazing in DTS.
The Others -
Truly creepy sound in this movie, amazing.
The Hunted -
Looks and sounds great throughout the whole movie, especially the opening scene.
The Incredibles -
It's a Pixar film.
Jurassic Park III -
Movie looks and sounds awesome, especially during the scene that's like 15 mins into the movie where the T-Rex fights that huge Ultra T-Rex thing with the fin.
Lord of the Rings special edition -
The opening scene of the Fellowship, my personal choice of a DVD benchmark. The battle for Helm's deep and the sound of the Ent trees walking around and talking in The Two Towers is great. And in the Return of the King the scene where that huge light fires into the sky, also during the giant elephant scene, some great surround sound effects and LFEs. The picture in Return of the King imo is arguably better then the other two.
Monsters Inc. -
Great looking movie, almost as good as Nemo. Sulley's fur is quite impressive.
Star Wars Episode II: Attack of the Clones -
Opening scene when the ships are landing, great low frequency tester. Visually the scene where Anakin and Padme are frolicking in the grass and having a pic-nic is very impressive. Some other great scenes are also the fight between Yoda and Dooku and the huge Jedi battle at the arena.
Star Wars Episode III: Revenge of the Sith -
The opening scene is truly great, one of the best. (I'm seeing a trend with opening scenes

) The battle between Yoda and Darth Sidius is awesome as well. The saber fight between Anakin and Obi-Wan is also another good one, and the chase scene between Obi-Wan and Grievous is also great.
The Mummy -
Excellent movie to test all around, especially the soundtrack and the sandwall scene.
Star Trek: Insurrection
Begining chase scene with Data is awesome.
Resident Evil -
Great looking and sounding, especially the opening song in the movie.
Armaggedon -
What can I say? This entire movie imo is truly reference quality.
Shrek 1 and 2 -
Amazing image quality, almost rivaling Nemo.
Tears of the Sun -
Disturbing movie, but the use of surround sound to create a "stealthy" feel to the movie is superb.
Terminator II: Ultimate Edition
720p and 1080p, nuff said.
Tomb Raider: Cradle Of Life
This looks and sounds astonishing, ending scene is great with the giant tree things.
Vertical Limit -
Excellent sound and picture. (and I just love this movie

)
Bad Boys II -
GREAT picture and sound, especially the huge freeway car chase scene.
Pirates of the Carribean -
Picture and sound are A+.
Stargate Ultimate Edition -
Really really good DVD. Excellent surround sound usage during the entering of the Stargate scene.
007: The World is Not Enough -
The opening scene is one of the best looking and sounding chase scenes ever. (another notable one is the car chase scene in The Bourne Identity)
Raising the Mammoth -
Such a great documentary, the picture and sound are great. (I know I know, it doesn't support DTS or DD but still sounds awesome)
The Patriot -
Awesome battle scenes, great use of directional audio during shoot-outs.
Jurassic Park 1 and 2 -
Both all around excellent, the soundtracks in these movies are great and so is the image quality.
Harry Potter and The Goblet of Fire -
Truly all around reference quality DVD.
The Cronicles of Narnia -
Great picture and DTS sound. (although this was the biggest cinematic let-down of all time for me

)
Final Fantasy: The Spirits Within -
Excellent DVD, one of my absolute favorites to test. The LFE's in the begining are amazing, it'll push your sub for sure. Also the landing scene where the troops shoot those guns and fall into that goo stuff, really awesome sounding. This is also one of the best looking movies ever made. (highly underrated film imo)
Thought of a few more -
Independence Day and War of the Worlds are also great DVDs to test.
King Kong -
How did I forget this DVD???? Amazing movie all around. Reference quality DVD, pretty damn amazing.
Well, seeing as I've run out of ways to compliment a DVD's sound a picture quality I'll stop there for now. I'll add more later as I think of them.