Try Stanley Jordan's 'Jumpin Jack Flash'. Jazz/blues. Amazing. The technique will floor you. He plays a walking bass line, comps chords, and runs all over the place at lighting speed at the same time. Plays with both hands on the fretboard.
For straight blues, along with SRV, I like some of Mr. Clapton's work. I have his Sessions for Robert J -- DVD and cd -- and it sucks. Audiophile-wise, it's great, but Clapton is just uninspired. Everyone around him is more into it than he is. Maybe he needs to shoot up again or something. Speaking of which... my all-time favorite blues guitar tune is Hendrix's Red House. One more... Buddy Guy's Dark Night Is Fallin.
I'll also second the Robert Johnson. And let me add some John Lee Hooker. I learned blues basically just listening to those two guys + SRV and Clapton.
On a more classical-ish note, check out Christopher Parkening playing Bach, or Paul O'Dette on lute doing renaissance music. You really hear the details of fingers on string and fret. With the lute music, you even hear him breathing. For a guitar guy, even if you're not into classical, these are technically really interesting. And beautiful besides.
