One other thought: I've had the pleasure of hearing many recordings of Ives' music. But I haven't heard them all. If one of your favorites isn't listed, contact me at Scottkmort@hotmail.com.
For a quick summary of my favorite recordings, click here. If you're new to Ives' music, and you're not sure where to begin, consider taking a look here first.
Ives & Recorded Music
I think Ives would have been befuddled by the idea of a "Recordings Survey" of his works. First of all, I don't think he ever imagined that his works would be recorded so frequently. Secondly, Ives disliked records, radio, and any technology that interfered with the direct experience of live music. Consider this characteristic quote on the topic:
At the very least, I hope that some of these recordings are among the 8 5/8% that aren't "sebaceous cysts"!!! Despite Ives' cranky idealism, I enjoy listening to music recordings. Most people (including myself) have discovered Ives' music through the medium.
Of course, there's no substitute for live performances.