Honestly, it depends on the use. At home we're about as picky with our balsamic and EVOO as we are with our wines. That is to say: not very. For daily use, we like Costco's Kirkland-branded, imported Modenese balsamic vinegar; it must have a numbered "Consorzio" stamp and/or seal on the bottle to guarantee it is an authentic vinegar. There are authentic balsamic vinegars from wine regions outside of Italy, but the seal makes it very easy to confirm you're getting a balsamic made from wine grapes. The Kirkland Signature stuff is a bargain, and is perfectly fine for quick dressings, or to make simple reductions to put on strawberries or to to dress a Caprese salad. I also keep a "tradizionale" on hand, usually aged 7 to 15 years, but it gets used very sparingly -- almost always on late-summer tomatoes from my kitchen garden (or a Caprese made with them). The traditional stuff can get spendy, though. I have a tough time justifying the expense.