Einaudi writes lots of music that incorporates strings, and he has at least score books (which I own), one with scores for his pieces arranged for piano and cello, and the other for piano and violin. There are other contemporary composers who do either two or three part arrangements as well.
That's what I used to play before we moved. For a while I had a cello friend, who then moved, and then after that I had a violin friend, until I moved.
With these friends, I've always only played contemporary pieces.