An oldie but goodie seasonal sweet I hope never goes away, the Reese's Pumpkin is larger than your standard Reese's Peanut Butter Cup, and, from my observations, employs richer peanut butter cream.
This to not to say, however, that you should restrict yourself to just one. Pumpkins are most fun in pairs, I think, so why not honor the consumption tradition of the peanut butter cup and eat two at once? Reese's, btw, should offer two in a package to facilitate this practice. Hope they get on that.