As far as price, quality and assortment overall, in my opinion the best kaiten sushi (revolving sushi) restaurant in Hokkaido. Kantaro in Hakodate might have slightly better quality sushi, but as far as price, size of each sushi and assortment, Nagoyakatei is hard to beat.
As far as assortment they not only have the standard salmon and maguro but also have things like California roll in the menu. The cheapest plates start at 120 yen, and go up to around 500 yen.
The Japanese characters for Nagoyakatei are なごやか亭.