If the pork is perfect, it doesn't need sauce....
But there are some tasty tasty sauces out there...there is a difference between enhancing an already good sandwich and masking the flavor/dryness of a bad sandwich. Also, the longer it sits out at a party, the more you are going to want to sauce it.
When I freeze pulled pork, I usually squirt some sauce in the bottom of the foodsaver bag before sealing...then when I want to eat it, I toss the frozen/sealed bag in a pot of water and bring back up to 170 or so.
My current bottle of homemade sauce is something along these lines (and staying low on the honey/sugar): http://amazingribs.com/recipes/BBQ_sauces/kansas_city_classic_BBQ_sauce.html