- Dr. Strangelove
- 2001: A Space Odyssey
- A Clockwork Orange
- Barry Lyndon
- The Shining
- Full Metal Jacket
- Eyes Wide Shut
They are all presented region free and with very impressive video and audio quality. Some of them are blessed with interesting supplements – for example, the commentary track on The Shining features Garret Brown, inventor of the Steadicam, Strangelove has a very rich Picture-in-Picture track, and there's a feature length documentary, O! Lucky Malcolm about Mr. McDowell.
On the other hand, Lolita and Barry Lyndon are essentially barebones.
At the current price, however, it must be a very hard box to resist. Just for today, the set is an Amazon Gold Box deal at just $62.99, down from a list price of $148.99.
Incidentally, the UK alternative is plenty cheap too, at £24.99 right now. You just need to know that it doesn't contain Dr. Strangelove or Spartacus, which you'd have to pick up separately (on all-but-identical discs to the US box) if you want them.
Note that all of the above titles are region free, it's just a question of where you'd like to buy them from or which permutation you're interested in.