[5370H55V]

I'm looking to get my first good set of cans, but I can't decide between the 2 in the title. I'm looking for something that sounds "fun", similar to the hje900 IEMs I have. There isnt much info regarding the O-ones; all I got is that they are basically ultrasone housings with tweaked drivers, so what are the differences between them SQ-wise? The ortofons have a detachable cable so I'm leaning towards it, but if the sound of the 580's are more to my taste I might consider them instead.
 
So if anyone can post their experiences with either pair of phones or their opinions on both it would be greatly appreciated.