Well I've been through at least 5 pairs in the past 6 months or so. When it comes to earphones, you'll want to get a pair that costs at least $5 for good quality. You can find pairs for $1 on eBay, but honestly it's a hit or miss. I got one pair that was high quality which I really liked, but the wire was cheap and it broke within a few weeks (then again I break thin wires easily). Then I got another pair. These ones were lower quality, and I didn't like them at all. The earphones that come with Samsung phones are pretty good, but the ones that are really cheap (such as with jackets or whatever) tend to be lower quality and you'll probably just throw them out. A good place to look is eBay or your local large electronics chain like Future Shop or Best Buy and get whatever pair costs at least $5 and you'll be well off.
Edit: The ones that go inside your ear tend to hurt your eardrum and block all outside noise which gets annoying. The other types are much better, with the possible exception that if you listen to loud music, everyone around you will probably hear it.