CC/Pearly Gates (double fat). I tell you what, I've used a Pearly Gates neck in several strats and I'm amazed at the blues voice it has. Hendrix/SRV all day.
I'll second the Blues Trembucker. I've got one in a custom 'Strat' and it can cover a wide range of styles and tones. My tone needs go from a solid rock sound to clean bluesy funky stuff and the Blues Trembucker nails them all.