I remember seeing or hearing about an in ear headphone where one can switch out the drivers... or housings... or something like that. It came with a few and each supposedly sounded different. I have since not been able to find what this was. I remember it was not a great product in a review i...

So I have been looking to many sites including head-fi for tips on what headphone to buy. My budget is 250$ and I have no way of effectively testing headphones at a local store. As such, I hope the head-fi community can act as my testers. So here it goes. I am looking for headphones that sound...