Headphone.com is in my mind probably one of the best places to get reviews.

I recently aquired a pair of Shure SE310s and have used grado 225s, sennheiser hd600/hd580s, akgs, and stax.

One thing I love about the headphone.com is the frequency response.

The Shure headphones are great if anyone is curious. They are a lot like the Grado 225s and they have a very neutral sound. Probably the most neutral out of IEMs I have used. Enough bass, but not overwhelming.