Crunchy, freshly made.
Cashew butter or Almond butter are also really awesome.
I am not a fan of the Skippy's or Jifs because they have too much sugar in them... The 100 percent natural stuff is quite good, and it's good exercise stirring up the peanut oil...
My favorite sammich in college (when i was young and didn't have to worry about my arteries) was peanut butter and bacon on rye bread toast... mmmmmmm....