I'm glad you've seen The Crowd. My other favorite is The Big Parade, mostly about a soldier's relationship with a French woman during WWI. Even when the material isn't good, King Vidor's direction transcends it. The tear-jerking of Stella Dallas, the camp of Beyond the Forest and the racism of Northwest Passage are somehow made tolerable under Vidor's supervision.

Like cinemabon, I like Duel in the Sun very much (but less than the two above-mentioned silents). I haven't seen Man Without a Star yet, as well as too many other Vidor films. Next on my schedule: his first talkie, with an all-black cast. It's called Hallelujah and it's reputed to be quite good.