Check out some David Grisman's "Tone Poem" discs. Very well recorded with a different guest(S)and vintage instuments for each...... Really cool stuff. SOme of the Waterlilly recordings (especially the Ry Cooder "Meeting by the river") are good too. For blues/electric check out "HooDoo MAn Blues" with Junior Wells (Buddy Guy on Guitar (vinyl version is best)).............. If you really want some of the best blues guitar playing and don't care so much if it's "Audiophile Quality" you can't do better than Robert Johnson's "King of the Delta Blues" IMHO.
Chris
Chris