If you want inexpensive, SE 215 is what you're looking for, for $99.

I have the 535's, which are a step up in drivers, and I love them. They aren't reference quality (which I recommend Etymotics for, and you can buy the isolating sleves for them), and are a bit on the warm side. The 425s are fairly similar, but the 535s are a bit clearer in the high-mids.

Any Shure headphones will have better sound quality than Apple, Beats, or Boise at similar price ranges, since they're built for listening, not fashion.