Color me skeptical about Pompeian, which didn't do well in the 2010 report; none of the three samples tested rated EV. In the 2011 report, 94% of Pompeian samples tested failed the quality test for EV based on International Olive Council standards.
The NAOOA is a trade association, not an independent quality assessment organization, so it's not surprising they'd certify an important product by one of their member companies. Pompeian is also an American company, headquartered in Baltimore. Only domestic companies are considered for the USDA Quality Monitored seal, so none of the overseas companies are eligible for it.
I'd like to know how Trader Joe's 100% Kalamata ranks; that's my current choice. I've had several of the high-priced local California ones, which are available at most supermarkets locally. They're excellent; but I cook with olive oil pretty much exclusively due to my husband's family health profile and it's hard to pay those kinds of boutique prices for your basic kitchen oil. The Kalamata stuff tastes really good to me, and it's affordable.