If you are into New Age or similar music, I presume you know of Windham Hill and Narada. Besides the western instruments, like piano and guitar, I have also been attracted to Asian instruments, like sitar (India), er hu (China), and Koto and Shakuhachi (Japan).
sitar -
http://chandrakantha.com/articles/indian_music/sitar.html
Indian classical instruments -
http://makar-records.com/siteus/frameinstrument.html
er hu -
http://members.shaw.ca/eip14/ , http://www.chcp.org/music/Vmusic.html
Chinese musicians in North America - http://www.melodyofchina.com/01artists/mian_01.html
Koto -
http://www.asahi-net.or.jp/~np5y-hruc/kt-koto.html , http://www.lindacaplan.com/koto/
Shakuhachi - International Shakuhachi Society -
http://www.komuso.com/
Also here are some artists and albums you might want to look into:
Zumi-Kai Original Instrument Group, "Koto Music of Japan", Laserlight, Delta Music Inc., 1999.
Joji Hirota, "The Gate", Real World (Narada), 1999.
"Lullaby for the Moon", Hemisphere, Capitol Records, 1998. (Japanese Music for Koto and Shakuhaci)
Kazu Matsui, "Bamboo", Narada, 2002 (Shakuhachi)
Kohachiro Miyata, "Japan Shakuhachi - The Japanese Flute", Elektra Explorer Series, 1977, 1991.
More Western Oriented -
Bo Hansson, "Lord of the Rings", One Way Records/Silence Records, 1970 - really interesting music (Hansson - organ, guitar, moog and bass).
Der Spyra, "HomelisteningIsKillingClubs," Manikin Records, 2000 (
http://www.groove.nl/cd/4/49050.html )
Cusco, "Ancient Journeys," Higher Octave, 2000.
Jean-Luc Ponty, "A Taste for Passion","Cosmic Messenger", and others, Atlantic, 1979, 1978, Electric Violin
Eberhard Weber, "Silent Feet," ECM, 1977 - electric bass/jazz/new age.
Good source for music for contemporary music from Europe -
http://www.groove.nl
As for guitarists, which was the OP theme, you might want to check out Jon Butcher (from Boston music scened in the 1980's). I would put him up there with Hendrix, Stevie Ray Vaughn, Page, and Trower. Butcher did a really interesing piece called "Holy War" on the album "Wishes". It may be hard to find it though - he was somewhat obscure.
Finally, and interesting group from Texas from 1969 into the 1970's - Bloodrock - first album, Bloodrock. Not what one would expect from Texas.