In no particular order:
1. Rope
2. Rear Window
3. Marnie
4. North By Northwest
5. To Catch A Thief
6. The Man Who Knew Too Much (1956)
7. Dial M For Murder
8. Saboteur
9. Torn Curtain
10. The Lady Vanishes
Special shout out to Psycho, Vertigo, Notorious, The Birds and Strangers on a Train. Can't remember if I've seen Shadow of a Doubt.
Not so keen on his version of the 39 Steps though. The 1978 version "The Thirty Nine Steps" actually seems to have more Hitchcockian elements than even Hitchcock's own version, such as the dramatic ending with Robert Powell hanging off the clock hands of Big Ben.
That seems like something Hitchcock himself would've thought of, so I'm surprised he didn't for his own version of the 39 Steps and that the ending was so sedate. After all, he did similar things himself with North By Northwest (the chase across Mount Rushmore) or Saboteur (hanging off the torch of the Statue of Liberty).