Those are some of prog/classic rock guitarists that I, as occasional guitar player, respect the most:
1.) Robert Fripp
, solo) - if there is emphasis on invention, variability and musical discipline then Bob is easily the greatest and most exciting guitar player in rock history. Not only a phenomenal guitarist but also a decent musician and leader of the geatest rock band ever, IMHO of course. Yes, he may be sometimes eccentric as person but I share most of his views on life or people's behavior at concerts (such as, for example; smoking, drinking, uncontrolably screaming and other unhealthy habits).
2.) Steve Hackett
, solo) - long ago known as enigmatic bearded guitarist for classical formation of Genesis. But I think that he realy started to show his full potential as highly creative musician when he began solo career. Afterwards he made some of the best albums in symphonic prog. A maestro of numerous guitar technics like finger tapping or pickering he is great persona as well.