I've a preference for 'real' peanut butter. Our local grocery has a peanut mill that mooshes to your preference, but has nothing in it other than the peanuts. It's the best. That said:
PB and real butter (no margarine, REAL butter)
PB and bologna (the more nitrites the better)
PB with raisins and ruffled potato chips
and a recent favourite: a sandwich made from PB cookies and vanilla ice cream (hey, it's still a sandwich!)