That's a hard choice to make, but I'm going to go with Nighthawks and The Hitcher.

They're both complementary to each other and could, if you wanted, make a fine doublefeature.

Both films rely on his physicality and his expressions more than dialogue, which is something that sells me on a performance; not how one delivers lines, but how they embody the character.

In both films, he is an antagonist who forms nearly symbiotic relationships with the protagonist. In Nighthawks, he's a terrorist who Stallone is aboslutely crazed about catching; in The Hitcher, he purposely seeks out C. Thomas Howell's character and is unrelenting in tormenting everyone else around them, as he wants Howell to kill him.

I get absolutely excitable when watching these performances of Hauer in particular, and the supporting casts are also up to the task. Everyone just hits their mark, which helps both films to transcend beyond being an action film and a horror film.

I love the climaxes of both films, which had me on edge on my first viewings and they still have an effect me on repeated viewings.

I'm prattling on, but this scene in Nighthawks:





And from The Hitcher:



These are major reasons why I recommend them. Aside from Blade Runner, those are the two perfect films to become acquainted with Rutger.