You know, there are so many.
For Texas blues, there's never been anyone better than Stevie Ray Vaughan. Sometimes it's not even like he's aware of what he's playing. It just happens.
For acoustic guitar, I have to go with David Crosby. He uses a lot of alternate tunings that give him a really, really distinctive sound.
Eric Johnson is someone who can simply play anything better than just about anyone else. I've had the pleasure of shooting Eric on a number of occasions, and he never fails to amaze. I've gotten to know him a bit over the years and he's also just a wonderful guy. Here's a picture of Eric and me in the green room in Ponte Vedra, Florida a couple years ago:
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Then there are two guys you've probably never heard of. The first is Guthrie Govan. I remember the first time I ever heard him: mind blown. Look him up and check out some of his You Tube stuff.
Doyle Dykes is a very dear friend of mine, and someone I've done numerous tours with. He's a member of the Grand Old Opry, and used to play with Grandpa Jones back in the day. Also, if you go to Disneyland or Disney World and walk through Frontierland, his music is regularly played over the sound system. He's is one of the finest, if not
the finest, fingerstyle guitarists on the planet. He's played with everyone from Chet Atkins to Eric Johnson to Duane Eddy. His rendition of "Wabash Cannonball" is killer:
I could go on, I really could... there are just so many...