Well, if you don't want to go through the trouble of modding phones, you know Koss has quite a few different models, a lot of them suck. Maybe one of their better ones, like the ksc-75 or ksc-35 would be worth looking into, I consider them to be one of ..if not the best sounding phones for under $50. Not bad for a $20 investment.
They're both clip-ons, not
exactly what you were looking for, but close.
Then there's the ksc-55, which
is a behind-the-head phone and uses the same driver as the afore mentioned ksc-75 & 35, but I haven't listened to them and only know what I've read here. Which is that they sound similar to the others, but either the headband fits, or it doesn't, like there's almost no in-between.
If you've got something like the ksc-17 or p 16, I think you'll be pleasantly suprised by the 35,75 or 55. There are people here with thousand dollar+ headphone rigs that have one or more of these as portable phones.
Here's a link to a ksc 35 & 75 thread.
http://www6.head-fi.org/forums/showt...ghlight=ksc-75
