I use sony earbuds. 7.99 at Meijer. I've run in the rain for hours with them and they keep going strong. I would never waste my money on expensive headphones.
You can get them for less than half I paid on Amazon right now.
For another $100 you can go to the earplugstore.com and have custom ear mold made for them.
It's beyond good and when they fit to your ear, off the hook.
Shure se215
They are a little pricier than what I would normally buy, but I happened to have a $50 amazon GC. I'm glad I bought them. They have excellent sound quality, bass, and noise isolation, for earbuds. Plus, their unique wiring allows you to change the wires easily and for a cheap price.
Sony MDR EX38IP/BLK (earbuds with volume control and mic on the left cable). They get plenty of abuse from running and gym work, and everyday use during my commute. I paid $25.
My Shure e3c's were expensive and only lasted slightly longer than a year before they started shorting out in one ear, so since then I go cheap on earbuds.