I love headphones and earbuds. I have many of the latest models and some old favorites that I play around with in between testing new releases to review for work, making me the go-to "headphones person" for my friends and family. After a brief interrogation about their needs and a short pep talk about potential splurging, I find myself recommending four models the most. Also: I wore 5 different headphones across 8 flights - here's how each pair handled my stress tests Many of my friends and family want an "all-in-one" pair of headphones that can excel in every environment and for every activity, but I have to break the news to them that they are looking for a unicorn. As my CNET colleague Katie Collins said, " everyone should have exactly three pairs of headphones " -- one for everyday wear and tear, one for exercising, and one for extended wear. Although I agree, many people I know don't want to invest in three separate pairs of headphones.…