My introduction to fusion was Billy Cobhams Spectrum album. Thats "fusion" and Im really not sure how much jazz jazz that stuff actually was, maybe it just sounds different because it was electronic but I rather think they were doing their own thing.
Cobham and Hammer came out of Mahavishnu Orchestra prior to the "Spectrum" album and Mahavishnu was some pretty radical stuff. Jerry Goodman was a sick young violin player.
"Inner Mounting Flame"
"Birds of Fire"
Later with Ponty on violin, different drummer and keyboards
"Apocalypse"
"Vision of the Emerald Beyond"
thats as far as my experience go with them
To me Chick Coreas band Return to Forever - Romantic Warrior is a must have. They were different from Mahavishnu, more refined, some Latin touches showing through, a soft and hard side, often mixed. This introduces the great Stanley Clark on bass and Al DiMeola on guitar.
Al DiMeolas later solo stuff was good adding more Latin feel
Land of the Midnight Sun
Elegant Gypsy
Casino
Splendido Hotel
Jean Luc Pontys solo albums I liked alot to, these were more spacy, atmospheric in a Pink Floyd kind of way at times, his classical training showed some influence. I'm fimiliar with these three.
Imaginary Voyage
Enigmatic Ocean
Cosmic Messenger
Jeff Becks "Blow by Blow" and "Wired" were great fusion albums
there are others Im less fimiliar with
Dixie Dregs was a whole nother ball of wax, adding southern rock, bluegrass and classical touches, more refined, more compositions rather than the jam oriented early fusion and much less abrasive to the ears.
"Free Fall"
"What If"
are must haves in my book
Thats the old origional electronic fusion and all Im really fimiliar with. Pat Metheny and Allen Holdsworth have been at it for years but I just dont have any of their music to advise by.
Gamalon is one of my favorite nitch bands that were doing fusion in the late 80's. Their self titled and Aerial View are quite good. The self titled more radical in old school fashion and is an amazing guitar album, Aerial view is more blended.
Lets not forget Frank Zappa, possibly the leading man in amplified jazzy bizarreness... but Frank was all over the map... pun intended. Pontys first American gig was with Zappas band. Steve Vai came through Zappas bands as well.
I have no idea what the current scene is