I don't usually hold out much hope for sushi at pan-Asian places, but I've been favorably impressed with this place over several visits. I had the sashimi lunch special consisting of salmon, tuna, hamachi, tako. It was nicely presented, well-cut, and immaculately fresh -- as good as any I've had at Oishii, Oga, etc.
They have a pretty interesting menu of Asian "tapas" as well.
Ponzu Fine Dining
286 Moody St, Waltham, MA 02453