I use two sets, one for work and one for the gym. My work set are Soul by Ludacris SL49 picked them up at Best Buy for $69.99. They sound great good bass, good mids and highs. Very good build quality, I was impressed with these earphones.
My gym set are the Skullcandy 50/50. I think they sound just a little better (maybe) than the Soul SL49's. It's a toss-up. The 50/50 have a little more bass. They do feel kind of cheap I've gone through two sets. Luckily they were covered under warranty.
I also had the BOSE MIE2i. Did NOT like these earphones at all. Terrible sound, would not stay in my ears, cord was too short. Also got those at Best Buy and returned them after a week of trying to work with the earphones, thats when I picked up the SL49's and have been very happy.
While they're normally $180, I found them on eBay for about $110, but you don't get the warranty unless you buy them from an authorized seller...and eBay isn't one of them.
I'm a big fan. Great noise isolation and great sound quality. Comes with a few different kinds of ear thingamajiggybobbers. I've already worn out two of the sets that came with it. So, anyone buying those might want to order more sets as soon as they figure out which ones they like best. (my favorites are the foam)