Now if considering classical guitar, now I can say something finally.
Andres Segovia is considered father of modern classical guitar. Forget about how other may or may not like his intepretation in a lot of things. His recording is generally good but I like segovia collection Volume 1 (1927-1939 Recordings). Very good for beginner. I think it is enough cover who is Segovia. Good for introduction to what really is classical guitar.
Julian Breams (English gentlemen) One of the best. His interpretation is more like Segovia, expressive. Tons of his CDs available. I think all are very good. But he is quite traditionalist...
John Williams Another best. His technique is perfect. Though some feel his approach is too mechanical. I think his best CDs are
"The Guitarist", "Mantis and the Moon", "Sevile Concert" ... Quite approachable for non-guitarist.
These top 3 are more or less considering greatest by most people. There are several more guitarist that are close to those 3 .. technically and musically. However, I think none right now have reach that wide accepted fame like these 3.
These are name that guaranteed that he/she is a very good guitarist. However, lot of them play several style which may or maynot suite everyone here.
BTW, Concerter de Aranjuez ??? is the most famous concerto for guitar out of guitar world. There are probably thousand version recorded. Adagio movement is the most famous one that several jazz musician like to play with. At least Miles did it in Sketches of Spain. Though there are several other as good (my opinion) as this concerto.
Okay.. here list of guitarist and some CD that I think non-guitarist may like it.
Sharon Isbin ... her Grammy awarded "Dream of the world"
Manuel Baruecco .... Steel & Nylon ?? this is great for non guitarist... he did duet with all kind of guitarist (of course all kind of guitar even electric rock type thing)
Jason Vieaux Laurate Series ... combination of more modern (traditional folky type ... ie. tango etc not.... schoenberg modern) Easily approachable for non-guitarist ..
When I say non-guitarist .. I also mean non-classical guitarist.
There are tons more good classical guitarist ... but not so many that do more or less crossover type things which I try to list here. There are also steel string which I didn't talk about.. and several nylon string jazz guitarist that certainly.. very talented and... produce really good CD.
Acoustic guitar.. is really a big big world. At least... it can be nylon or steel string... style ??? Hawaii, Jazz, Classical, New age ...
I can go on and on...
but hey... it is the only thing I can probably write down here.