Holy smokes, this is pretty shocking knowing your tastes. Get that Marlene Dietrich Glamour Collection set stat!! It has Blonde Venus (my favorite too), plus Morocco and The Devil is a Woman, as well as two non-Sternberg titles (which I haven't watched yet). Also, The Blue Angel and The Scarlet Empress are absolutely essential. The Dietrich/Sternberg movies are some of my favorites ever and, like I said earlier, knowing your tastes (which very often overlap with mine), these should be your favorites too.
My friend got me the Glamour Collection for my birthday last month and I got around to watching
Blonde Venus one night but I wasn't able to find the time to watch the rest of the collection since I was catching up with 1950s and Vincente Minnelli movies, etc. But I swear I will make this summer all completely Marlene.