what is your favourate brand of sake?

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Cheap and excellent sushi is widely available in Toronto - but sake? Not so much. My husband and I are going to be vising California in a couple of weeks, and today I had a flash of inspiration. We're each allowed to bring a bottle of alcohol across the border duty-free - so why not get a couple of bottles of really good quality sake to take home and enjoy later? Only trouble is, because we can't *get* good sake here - I have no idea what to look for. Any suggestions from fellow Japanese food fans?