If anyone cares, I opted for the Bernstein. It has the advantage of offering movements as separate .MP3 files, instead of each work as an undivided file as the Thomas/SF and Mata/Dallas do. The Kunzel was only available as a CD, not downloadable. I realize these aren't very artistic criteria but at this stage of my exploration, easily repeating movements has been very useful.
I'll cherry-pick El Salon as an individual non-album download later. Thanks for the help.