The wiring in the plug stem of my Sennheiser PX100 'phones finally broke, so now I need a replacement set for working out. I'm not averse to buying another pair of PX 100s, but first I wanted to look around to see if there are any other contenders. The main criteria for these headphones are: Size comparable to Sennheiser PX100 Relatively light. Can be a bit heavier but not too much Can be taken off easily (unlike IEMs), but stay in place when running. The PX100 slides around more than I'd like Efficient. Often will be using Samsung Galaxy S phone as the source. It doesn't have much power and even the most portable headphone amp is awkward at the gym. Sounds at least as good as Sennheiser PX100, will be used for a broad assortment of music. Doesn't isolate too much. These may be used for walking around in a urban environment, so I want to have some aural awareness, particularly traffic noise or loud voices. Right now, besides the PX100 and PX200, I'm looking at: Grado SR60 or SR80 Sennheiser adidas PMX 680 and HD 238 M Studiophile Q40 Beyerdynamic DT 235 Klipsch Image ONE Audio Technica ATH-FC700 or ATH-M50 AKG Q460 Yuin PK1 or PK2 Thanks in advance for any suggestions!