In-ear Headphone Advice Requested

I recently bought a pair of Audio-Technica M50 headphones, which sounded great for the price, but returned them because I didn't like the heavy, enclosed feeling of full-size, around-the-ear headphones. I now find myself wishing for in-ear headphones with sound quality similar to the Audio-Technica's. Does such a thing exist for a price that ordinary mortals can afford? I've listened to in-ear headphones that were very clear and detailed, but the music didn't have the "weight" that it had with the Audio-Technica headphones.

Suggestions appreciated.