I've listened to all those artists a lot (and still do) except for Pink Floyd and George Thorogood (I like what little I've heard of them, but I just haven't gotten around to hearing many of their CDs as a whole), and I also like...
The Turtles (and Flo & Eddie's solo stuff)
Eric Clapton ('70s solo CDs and w/ Cream)
Kiss (makeup period, 1973-1983 or so)
The Allman Brothers Band
Bruce Springsteen (sometimes)
Van Morrison (mostly '70s)
The Beach Boys (but mainly their non-surf/car-related stuff, i.e., PET SOUNDS, WILD HONEY, FRIENDS, SUNFLOWER, LOVE YOU, and Brian Wilson's solo stuff, especially his new SMILE. They're a deeper group than their early Surf hits would suggest. Everyone thinks they're all wholesome, but if you really get to know their history/music, you'll find that's far from the case. LOL!)
There's probably others, but those are the groups that come to mind right now.
The Beatles (Every album is different)
Earth (Pre Black Sabbath)
Jimi Hendrix Experience
Creedence Clearwater Revival
hmmm.. Sumbody should define "classic rock" cuz sum of the bands I'm seeing doesn't fit what I thought "classic rock" is. But judging off of the lists already posted ima hafta add Priest, Iron Maiden, and Ronnie James Dio mayn.