I know, you are interested in solo guitar. But....
Sharon Isbin/Carlos Barbosa-lima Rhapsody in Blue/West Side Story. Gorgeous.
Check out the Groovemasters series on Solid Air, a dozen or so albums, each pairing two excellent guitarists... For example, Vol 1 pairs Laurence Juber and Preston Reed.
The California Guitar Trio...try Whitewater or Masterworks.
The Los Angeles Guitar Quartet...one of my favorites is Guitar Heroes, but their catalog is very good.
Tommy Emmanuel's solo works are jaw-dropping, but don't overlook his duet albums with Martin Taylor, Jim Nichols, and Frank Vignola (that one is Vol 11 of Groovemasters).
Staying in the solo guitar realm, good recommendations for Doyle Dykes, Tommy Emmanuel. Also check out Martin Taylor (jazz), Pat Donohue (excellent house guitarist on Prairie Home Companion), off the top of my head.