Sorry for exhuming this cadaver of a thread, but a couple of insomniac nights spent watching old Alfred Hitchcock Presents episodes got me to check for a discussion here, already in progress.
Btw, CHARADE was directed by Stanley Donen.
I'll see your Stanley
Charade and raise you one.

A similar film Donen made was
Arabesque (Gregory Peck, Sophia Loren), similar because it riffs on that same "secret identity" vibe. It's a little more serious than
Charade, but the only thing awkward I found was Gregory Peck attempting some forced humor. I still like it, though.
In a similar "thriller" vibe, I could also recommend
Experiment in Terror, which was directed by Blake Edwards. I think it was his only thriller, and I found it well done. Features Glenn Ford, Lee Remick, and a teenaged Stephanie Powers.
BTW, there is a common theme tying all three films together....
And now, for a word from Hitchcock...
1. Vertigo
2. Psycho
3. Rear Window
4. North By Northwest
5. Shadow Of A Doubt
Good picks! In my list, I can pick five, but not put them in a particular order: Vertigo, North by Northwest, Strangers On A Train, Rear Window and probably Psycho. And Psycho I might switch out for one or another of my favorites like The Man Who Knew Too Much (1956), Dial M For Murder, Rope (partly due to the convoluted way in which they filmed it), To Catch A Thief, or even Rebecca and Notorious, depending on mood.