I saw a post-apoc movie a while back (not Mad Max) on Movie Plex. I can't remember the title but it was about four guys, a kid, and a lady trying to get to New York because they got radio signals from there awhile back. The movie looked like it was made around the late 70's early 80's. I was flipping through channels then saw a nuclear explosion, the credits began rolling, and bam, a guy on a dirt bike, racing through the desert, trying to get a blow-up doll to his post but was cornered by radscorpions. He lost the blow-up doll.
Anyhow, best actor for an apoc movie-
I'd say either Eric Bana, the young Slyvester Stallone, or the young Mel Gibson.
Best actress for an apoc movie-
Either Estella Warren, Demi Moore, or Milla Jovovich.