Hi, I am wondering which one of these sound good without any amps, and sound good with an ipod touch.
If your a basshead then go with the beyers, for portability go with the M50s, and I wouldn't recommend the 595s as you could buy the 555s and do the foam mod.
take note that the 770s are hard to drive unless you get the 32 ohm version, and the 555s are low on bass unless you eq. no problems with the M50s.
I'm currently still using my 555s and love them, I got them because I'm not a basshead and I like to watch movies and play games with them too which there great at with there big sound stage.