The headphones that came with your MP3 player might not do justice to your tunes, but it won't cost you an arm and a leg to give your ears a treat.

Our latest headphone tests found a number of models that can upgrade your listening experience, whether you’re on the go or relaxing at home. (Headphone reviews and Ratings are available to subscribers.) One of our recommended portable models, a Sony, costs just $20. The best-sounding headphones we tested, two Grado home/studio models, cost about $100.

For portable use in situations where you want to reduce external noise—while sitting in a crowded airplane, for example—you may want an isolating model that physically blocks out those sounds. But keep in mind that this makes you less aware of your surroundings. A non-isolating model would be a safer choice when you’d want to hear external sounds, such as station announcements on a train or a car approaching when you’re walking or jogging.

For the ultimate in sonic serenity—to block out the screaming baby in the next row or the mind-numbing cellphone chatter on the commuter train—check out the active noise-canceling models we tested recently.

With any headphones, don't forget about fit. Heads and ears come in all shapes and sizes, so make sure headphones fit yours comfortably, especially if you'll be wearing them for extended periods of time. —Eileen McCooey

Related: Headphones Buying Guide (with video)