I'm a bit shocked this hasn't yet been a thread.

Nevertheless, based on the diversity and quality of products, I tend to think gourmet market in Bangkok, some Migros in Istanbul, city market in Mexico City, and Ametller Origen in Barcelona top my list, plus an * for Japanese konbini.

If I had to choose two -- which I don't -- from the US, I suppose netcost and Mariano's are sufficient. My taste buds of course would clamor for Trader Joe's, but they put a lot of weird [things] in their merch. Plus, their produce sucks.