Ive had MANY JBL's and I can tell you DONT get the L100's for 70's/80's Classic Rock. I would also NEVER suggest HARBETH because they are far too polite for this Genre.
My favorite JBL's is actually a Combo that I use together...The L166 for the High's and the 4312A Monitors for their amazing midrange. Both lack what the other has in spades but combined they are sublime. If you need any work done on vintage speakers I would highly recommend MILLERSOUND in Pennsylvania. Bill does an incredible job and his prices are very reasonable. He installed NOS Tweeters on my JBL's, Refoamed the Woofers and they are basically brand spanking new.