Holiday Market is a great jewel in Canton. It is really known for its huge wine and liquor selection, but also has a great deli (enormous number of cheeses) and bakery. The meat counter is great, offering high-quality cuts of beef, pork, chicken, fish, etc.
And if cooking isn't always your dish, they have delicious soup, salad, sushi and olive bars. Their u-bake pizzas are a great change of pace- a little more diverse than just pepperoni.
Only negative, it isn't always competitive on prices. But if you are looking for top-of-the-line quality, this is definitely the place.