I just finished re-humanizing my Concert Guitar pieces. I discovered that my using more Vibrato samples that non-Vibrato samples, I liked the finshed result a lot better. When I play my classical guitar, I do not use Vibrato as I tend to play Lute music and use my fingers to produce a much more mellow sound and not the traditional finger-nails used for guitar. I wish that there were samples for just finger playing.
http://www.markthomas.ca/virtual-classical-guitar
Hope you like them,
Mark