Here's my list, not neccecarily in order EXCEPT Chris Farley will always be my number 1. As 3 of my 5 picks are from the late 80s/early 90s, this era is easily my personal fave for SNL.
1. Chris Farley. I have never laughed harder than my first time seeing Motivational Speaker Matt Foley.
2. Kate McKinnon. Utter genius.
3. Dana Carvey
4. Jane Curtin
5. Jon Lovitz