i'll have to go with young guns Robert Randolph and Derek Trucks
As far as the older guys go, buddy guy for sure, warren haynes, john scofield, fareed haque and john mclaughlan
Plus some unmentioned names!
Jimmy Page (how the hell was he not mentioned yet???)
John Butler (if you don't know him, you should)
a lot of other named guitarists belong up there too, many of you mentioned some great guitarists
but Bobby Weir? NO. I respect his work with the dead, but as guitarists go, he is nowhere near the level of the greats