The best acoustic guitar recordings??

You seem to have many suggestions here so not sure if these gentlemen has been recommended already. I will however throw these in the hat:

Bill Frissell, I would try “Unspeakable” for starters as to me this album is definitely more vibrant and less safe than his usual, plus he is using more of the guitar and effects to the advantage of the overall sound. If you like this try some of his other safe albums. 
Also have you listened to any Michael Hedges?

Happy listening,
Chris

Mississippi Fred McDowell "I Do Not Play No Rock&Roll".
Also, his requiem album. No title, just Birth and Death dates.

Almost any direct to disc recordings of acoustic guitar