Thank you so much for your opinion and for pointing me to that other thread, it truly helped me decide. To be honest, I was leaning towards the Portapro, but after reading all that, I'll definitely go for the M50s. It will be a great upgrade from my old Panasonic RP-HTX7. Plus, winter is coming...

Dang you make my choice difficult :P I hope I won't end up buying both of them. By the way, I didn't know what YMMV meant; at first glance, I thought it meant "You Make Me Vomit" haha

Ooh, I didn't know the Portapros were open! Thanks for the information, I'll read on that. As for the IEMs, I don't like them much.

Hello all, I'm new here   So for the last couple of days, I've been searching for a new pair of headphones to use with my mp3 player (Zune HD). After a lot of reading, comparisons, and eliminations, it now all comes down to the Audio-Technica ATH-M50 and the Koss Portapro. I know their price...