I'm looking to replace the iPhone microphone adapter and controller for my ATH-M50, and it looks like the MPA-3C has been discontinued. Are there any other similar (or better options) out there now? Would custom be an option? I'm hoping someone can point me in the right direction.

I'm trying to figure out what is the best pair of portable, closed headphones I can get for use with my unamped iPhone. So far, I'm leaning towards the Sennheiser HD 228, and folding is not a requirement. I just want something to listen to on the train to work without disturbing other people...