I remember vaguely Jack Paar, but Johnny Carson stand most in my memory. Loved his show. I actually like all the late night people (Letterman, Fallon, Conan & Leno as well). I am not as familiar with Jimmy Kimmel so can't really say.
Anyway I am so please that it's Jimmy Fallon taking over Leno's spot. I gotta say, I seldom watch his show beyond monologue but have seen some clips from the show and the guy cracks me up. His impersonations are outstanding.
I think he's the perfect choice. Just my two cents.
TIS