Tell your mate he's deaf!
But seriously, I have an Ovation Balladeer - sounds as sweet as a nut and has done for many years.
Electro-acoustic model with six individual built in pick ups under the bridge, so that when amplified it sounds richly acoustic, like it has been miked instead of getting that flat "electric" sound one usually gets when placing a pickup under the strings in an acoustic guitar's soundhole.
If you want to stretch yourself try some middle period Joni Mitchell from "Blue" through to "Hejira". Some fabulously open sounds obtained through some fairly exotic tunings. Ditto Ry Cooder.
If you're looking at developing picking techniques, Paul Simon is a greatly underestimated acoustic axeman. Check out "Anji" on the "Sounds of Silence" album.
And of course the composer of said tune and one of Simon's guitar heroes Davy Graham should keep you up nights scratching your head. Just spotted a cheap career retrospective CD of Graham in the HMV sale I think - about a fiver or so. Had everything of his you'd want on it.
Should find details of tunings and music / tablature on the net fairly readily.