Nami is a reasonably priced high end sushi restaurant. Try the sushi spring roll (a roll wrapped in rice paper with some fish and avocado around the outside)...also definitely try some of the individual grilled items like the whole fish or ribs.
The restaurant is very elegant and they will usually accommodate reservations for specific tables/areas (i.e. booth, hori-gotatsu sunken floor, standard tables).
The service is quite quick and 'authentic' Japanese.
Extensive sake list for the Japanese rice wine connoisseur.