Duane Allman was truly great.
Check out Steve Rothery from Marillion. His solos send chills, similar to David Gilmour.
And Steve Hackett from old Genesis and his solo work. He is extremely creative and unique. I love his Ace of Wands but he is best known for Firth of Fifth which is my all time number one favorite song, and his solo has a lot to do with that (besides Peter Gabriel who is also a unique talent!).
Finally I can’t not mention Brad Paisley. I don’t normally listen to country, my wife got me into it some, but Brad’s guitar work is amazing. He occasionally enjoys showing off in like 128/128 time signatures, and by golly, he and his talented band hit every note. In this respect, there are vague similarities to...
Nuno Bettencourt of Extreme. Wow, I love what this guy can do with his guitar. And Gary Cherone matches with what his voice can do. Eddie Van Halen should have wished he was as good as Nuno.
EDiT: In Brad Paisley’s song Start a Band, he gives nods to Allman and Skynyrd as he sings “get you a guitar and learn how to play...”. He gives a lot of nods in a lot of songs.