I know that existentialism is a rather broad terminology, but I'm more referring to a Nitzschean view on existentialism. There are obviously paralells between individualist tendencies of existentialism and of course those of us who are indvidualists. Existentialism seems to be supportive of self-determination and many of our economic principals, such as spontaneous order/emergence and self-organization, etc. You get the point.
I haven't read completely into existentialism, I always just knew I was an existentialist and never really sought to broaden my horizons, but I think my view on society and people in general, that you shouldn't take pride in things like your looks, ethnicity, etc., (pedigree) and rather should pride yourself on accomplishements and merit, is the ultimate form of existentialism, to me. If I'm wrong, feel free to correct me, as this is an area that isn't discussed a lot, but from what I gather, most libertarians share this same sentiment.
Am I wrong (on either point)?
As far as the early German subjectivism/perspectivism of Nietzsche, Kierkegaard, and Stirner (and I think some one pointed out recently that of Wittgenstein, though that is beyond me) Austrian economics seems to fit quite well within that school; not so much with the later existentialists such as Buber, Sartre, Camus, etc though.
As far as what to take pride in, that can't really be answered.