Audio Technica ATH-CKM50A In-ear Headphones with 12.5mm Rare-earth Drivers and S/M/L earpieces, White - Reviews
Pros: Great bass. Clean sound.
Cons: Harsh when pushed even slightly too far. Small soundstage.
Used these mainly for jogging. They fit great for me, a little intrusive, but they never ever came out when I ran. Great sound for the price (at the time.)