You should get "Yellow Princess" - great Fahey record from 1968. I'd also recommend "John Fahey and Friends - Friends of Fahey Tribute" from www.slackertone.com. It has a previously unreleased track from Fahey's last acoustic recording session and other great guitar players like: Woody Mann, John Renbourn, Tihn, Terry Robb, Mark Lemhouse and John Doan paying tribute to the great late Mr. John Fahey. - If you're interested in slightly other techiques as well.

By the way, have you seen the video on YouTube.com of John from 1969, I think it is. Great footage of him playing on some strange TV show.