For Ólafur Arnalds - "For Now I Am Winter" is maybe his most accessible album, but I think the shorter EPs "Found Songs" and "Variations of Static" are his most relaxing music (I'm still tracking down a few other albums).
For Jóhann Jóhannsson - "Ibm1401 - A User's Manual" is the most different, but "Fordlandia" is so far my favorite.
He is also in the group Apparat Organ Quartet which is a whole different sound.
Thanks man, I will check those out as well as the Apparat Organ Quartet.
I recently had some friends here visiting, wish I had caught onto this a bit sooner as I think they'd have loved it, I'll have to pass it along