I'd like to put in a vote for the Sportapros:
Here's my mini-review for the best value/ugliest head phones ever:
While not a fan of super exaggerated bass, I do err on the side of slightly emphasized low down sounds, especially for phones on the go for working out, etc.. Also, I'm not looking for super high fidelity when I'm doing sit ups and biking through downtown. These headphones are light and they sound really good at high or low volumes, even with a good amount of bass. I tested them out on my current headphone killer "Fight Club". It has a lot of techno-low throb bass tracks that my Grado's, my Sharp phones that came with my Minidisc player(crap) start to cry about at high volumes. Try the end of track 3("What Is Fight Club?"). Although no headphone(or speaker) has ever been able to handle that track without distortion, including these, at high volumes, these were the highest I've ever been able to crank that track. These phones also sound good with classical(Vivaldi's Four Seasons, YoYo Ma), vocals(Otis Redding) and pop(The Police)
Now for some not so good's. These things are UGLY. I mean U-G-L-Y you ain't got no alibi, ugly(i just had to sneak in a 2nd grade insult in there.) I like old school looks(just like my jokes), my Grado's are pretty funky and I like em, but these things are a joke. The "sport" mode that wraps around the back of your heads looks pretty foolish too. My only hope is that folks don't look to closely at the gym or when I'm zipping by on my bike. Also, while comfortable on your head(they have little foam rests that help cushion the force against your ears) they have a disturbing tendency to close really tightly around your neck(either pressing on the side or on your adam's apple) if you are letting them rest there. Not a huge deal, since they fold up to fit in your pocket, but still..
All in all, I heartily recommend these. They give my Grado SR-60's a run for the money(they cost 60) and kick out a good amount of bass without sounding murky(in all fairness, the Grado's are way more transparent, but they are also very bright and get me yelled at by bus drivers all over town). I was also surprised at how long I could listen to them without getting "tired" of the sound. Even with my Grado's, possibly because they can be a bit bright, I get fatigued and need to rest my ears and brain for a bit. But these little guys keep on kicking out the sound. Buy them. You won't regret it. Plus they have a life time warranty, so if you get beat up for looking so incredibly dorky, you can replace them(i'm not sure if Koss covers getting your butt kicked, but it would be worth a try)