I have tried CENTO, and a few others. Definitely not HUNTs.
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Though technically not San Marzano tomatoes, I like Muir Glen organic whole peeled the best. They consistently are the best from can to can.
I have tried these [http://www.amazon.com/Carmelina-Marzano-Italian-Tomatoes-28-Ounce/dp/B000R923TU/ref=sr_1_sc_1?ie=UTF8&qid=1330630968&sr=8-1-spell] ones a couple of times and enjoy them. But SeriousEats.com did a taste test awhile ago and Luigi Vitelli scored the highest of all.
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This month's Cook's Illustrated was pretty emphatic about choosing Muir Glen over the Italian brands, even the ones with a DOP certification. I just tried them in a lamb stew last night, and I'm not so sure the stew tasted a little sweet and not quite as deeply interesting as I'd expected. But I could be wrong, as I didn't taste tomatoes on their own.
And by the way, Cooks also like Hunt's.