Hi Joker, great thread!!
I was looking at getting a budget iem and you seem to be the best person to ask this, I have pretty much only used my samsung galaxy S2 headphone, as far as iems go.
I tend to listen to rock, folk, acoustic, orchestral soundtracks and a bit of electronic and pop music, for hours on end, mostly while I draw, so I guess that something smoother, less fatiguing would be better - I do love clarity though.
I'd say it is comfort = sound quality > durability > isolation > microphonics > anything else
The UE 500 are available for U$28 on Amazon. Should I go for them or spring a bit more and go for something else, like the gr02 or the Brainwavz M5?