I can vouch for Crimson Tide. Not only is it a great film with stellar acting and performances, the AC3 soundtrack is very dynamic and involving. I've only ever seen this movie on Laserdisc and I've seen it many times.
Ransom is good too and its the directors cut which is only available on Laserdisc.
Jurrasic Park and Lost World have very good AC3 tracks. Spielberg only wanted to release the DTS version of Jurrasic Park because he was supporting the format, but an AC3 version was eventually released 9 months later. Although I am biased towards the DTS versions, I owned both AC3 discs before I owned their DTS counterparts and I can assure you they both have strong and impactful AC3 tracks.
Aliens has a very good AC3 soundtrack but its only available on the theatrical version. Although I prefer the extended cut of the film, the Laserdisc release had a notoriously noisy transfer and because its release preceeded AC3, it only has dolby surround. Theatrical cut has a really good pressing in comparison. So the AC3 version can be a great way to watch the film on Laserdisc if you've seen the extended cut a hundred times like I have.
Although Titanic uses a 16 bit master for the AC3 track as opposed to the 18 bit master used for the DTS, it still sounds truly fantastic. If you're the sort of person who can stomach this film (I know many cant!) then please endure it for the soundtrack because it has a really enaging and enveloping score. Years ago, I went with a certain someone to watch Titanic on the big screen at the Royal Albert Hall. The selling point was the film played to an accompanying orchestra reciting the films score. The orchestra was too loud and you couldnt hear the dialog so they had the subtitles turned on. The picture was so blue and overly saturated I couldnt enjoy it. The orchestra was pretty cool overall but I kept waiting for music cues I had memorized from the AC3 LD and they never really materialized. The whole time I kept thinking how much more I enjoyed the LD soundtrack. One plus of the night was James Horner made an appearance. I think he died a few weeks later.
True Lies. This one was a reference for me back in the day. I used to love showing this film especially to people who hadnt seen it. Its a great action spectacle and the harrier jet scene is a room shaker.
Another great one is The Fifth Element. This one was apparently SuperNtsc encoded with a chroma resolution of 2Mhz so the picture quality is top notch. It easily has one of the best AC3 tracks. The part when the blue alien starts singing on stage. The frequencies are so high it could shatter glass.
