Voted for Cuddly puppy.

Why the puppy? Well, I'll outline the why.

Cute kitten - more useful than the puppy; they are natural pest control (not to mention they are smarter)
Homeless person - Better him than the puppy, but the driver would go to jail
Pregnant lady - even if the lady were a bad person, useless or a burden, the baby still gets to have his chance in life to better the world
Cuddly puppy - although probably harmful, he's also probably worthless when considered for any other purpose than the emotional
Child playing on the pavement - A child who is stupid enough to play on the pavement should probably deserve to get killed, but the driver would go to jail
Elderly person - you kill them, you go to jail
Beautiful girl - you kill her, you go to jail

If the driver were safe from going to jail, I would choose the drunk and dirty man. He's harming society already.