Stewie is right. Other than a local group probably unheard outside of North Arkansas, in my opinion there is no better version than that of Jim Watson, Tommy Thompson and Mike Craver of the Red Clay Ramblers.

A generous two minute sample can be heard at CD Baby. The entire album is worth having. I just transferred my vinyl to CD a couple of months ago. It is one of those albums that periodically gets dusted off and played again and again. It never gets old for me.
http://www.cdbaby.com/cd/redclayramblers

As to the Achans, I have to confess to having sluffed over that one so much that it had no meaning at all to me. Draw your own conclusions here and other places around the net. http://en.wikipedia.org/wiki/Achan