You'll know a true, traditional style balsamic - or 'tradizionale aceto balsamico' - by the price tag. It's usually well over $100 for one 100ml bottle. That's because it's been barrel-aged for at least 10 years, and sometimes much longer than that. It will be stored in a traditional bulb-shaped bottle, and it's usually stored in its own wooden box. This kind of balsamic is painstakingly created to be valued and savored in special moments. Not necessarily what you'd want for your regular salad dressing.
For whipping up an everyday vinaigrette dressing, you'll want something that's much more affordable, while still maintaining the taste profile of the quality balsamic flavors - that perfect balance of acidity and sweetness.
I'm partial to We Olive's aged balsamic vinegar. It's delicious enough that I can eat it alone on greens and be satisfied. It's a great compromise of excellent flavor and high quality - at a fairly affordable price. Plus it's made here in California, so I can feel good about buying locally.
If you're not sure about the quality of the balsamic vinegars available to you, a decent shortcut is to try a balsamic glaze. Basically, the glaze is a cheap balsamic vinegar, reduced for thickness and sweetness. Be careful of added sugars! But a balsamic glaze is generally inexpensive (easy to DIY, too), and can be used just like the high quality aceto balsamico, without breaking the bank.
