I think the 1977/78 cast was, collectively, the best there was.
Dan Aykroyd
John Belushi
Chevy Chase
Jane Curtain
Garrett Morris
Bill Murray
Laraine Newman
Gilda Radner
Toss in the occasional feature player or hosts, Hugh Hefner, Charles Grodin, Kevin Nealon, Al Franken, and Steve Martin, and that season was one of the best ever.