I have to say that there are so many talented musicians around that it amazes me. I enjoy slide guitar also and I bought a CD back in the 1990's by Sonny Landreth. I put it on and I hear Mark Knopfler singing. It turns out that Sonny is one of his favorites (as well as a favorite of Clapton).
Sonny is one of those players that has incredible left and right hand techniques. He is one of the few slide guitarists who realized that he could play slide and then additionally play notes under the slide at the same time. If you listen to Sonny it is difficult to believe that he gets so many sounds out of his guitar. Next of Kindred Spirits is a short intro to his style:
Here are Mark and Sonny together in Blue Tarp Blues:
David