I got to see Stevie Ray Vaughan in'86 or '87. Sadly, he was too F'd up & just mailed it in. Fortunately, Bonnie Raitt opened & she was worth the price of admission all by her lonesome. Saw Clapton in '85 & was kind of underwhelmed. I love Cream, Delaney & Bonnie, Derek & the Dominoes, 'n Blind Faith, but I just don't dig the stuff he got into later.
Seeing Van Halen with DLR for their 1984 tour was cool, though 1984 was my least favorite of their albums (& is where the band 'died' for me). Poor opening act played about 1/2 a song before they got tired of dodging beer bottles, which I thought was an asshole move on the bottle throwers' part. Catching Deep Purple in '86 for their reunion/Perfect Strangers tour was awesome. FWIW, I saw DP again last fall & Ian Gillan is still killin' it at 70+ y/o.
I guess the 'ultimate' for me was getting to see Jimmy Page & the Black Crowes in Raleigh in '00. I've been a huge Zeppelin-head since I was a kid, so it was awesome to see one of my guitar heroes & hear 3 1/2 hours of live Zeppelin done right. Killer show & hooked up with a smokin' hot red-headed cougar.