Here is one set, which sounds good and has many good reviews.
http://i.gizmodo.com/5191218/shure-s...e-new-top-buds
There is a mic adaptor, so you can get them to work like the stock iPhone earbuds.
Another brand to try is Ultimate Ears. They make some really Pro stuff, the kind of buds Dr. Dre would really use in the studio. Some of their buds are custom modeled to your ear canal, but we're talking $2,000 with 4 drivers in an ear. As I said, I wouldn't spend that much on an iPhone, the marginal cost on these headphones don't reveal a benefit on an iPhone.
My audiophile friend has a set of these and is very happy, but he also plugs them into his little headphone amp and usb DAC for music at home.
http://www.ultimateears.com/_ultimat...superfi5vi.php
Here's the bottom line, don't spend too much on headphones for an iPod or iPhone. The sound quality coming out of the headphone port is a joke. Honestly it's like slapping a set of racing slicks onto a KIA. Yes the cornering does improve, but the tires won't turn the KIA a Super 7.