Interesting thread. It rescued me from almost an hours worth of TV. I was well into page two before I got that it was about Angie and not Anji. As a finger-style player the Davey Graham tune was what came to mind first. Incidentally even though it was played on the third fret and sounded like Cm most guitarists will think of it as being in Am because it uses Am 'shapes'.
I actually tried playing it in Cm without a capo. It would be possible but I don't need that much work, or grief, right now. The first version of Anji I heard was by Bert Jansch, and I saw him playing it on video just last night. He said Davey Graham told him he played it too fast and with the wrong notes. I suspect more people have heard Jansch's and Paul Simon's versions more than the original. So much for the composer's intentions.