Hadn't had much experience with IEM/earbuds. the only experience i had was Phonak 232 (very good balanced, my favorite so far), and FAD piano VIII ( piece of crap, i wonder how they can sell it at the initial USD 1,000 price, no offence to FAD lovers out there). But the pistons for me is just for general use to block out office squabbling and gossiping LOL. If its better than I-buds or beats earphones why not?

Rig: Mostly on One Plus One phone

Usage: daily outdoor wear during my commute to class

File format: MP3,FLAC

Genre: Varies a lot, from electronic rock(Muse), Indie( The Strokes, Arctic Monkeys, The National, The XX,Tame Impala), Rock (Foo Fighters), Melody (Pink Floyd), experimental (Radiohead),Punk(Blink182, +44), to pop( JT, Katy Perry), Bon Iver, Kodaline, the list goes on. 

Headphone/ earphone type: IEM

Other requirements: I'm not really sure on what I'm looking for, but maybe somewhat a balanced sound or more on mid-trebles.

Brand: No preference

Budget: ranging from 120AUD-350AUD( ~RM350-RM1050). I don't mind buying used.

Current target: I've looked at Shure SE215, SE535, Senn IE80, Westone 3, 1964 Ears V6 Stage. I hope you guys can recommend either of these or suggest me a better IEM in your opinion.
I currently owned M50s and it has been a year since. A great closed headphones, really an upgrade from Senn HD202 and loving it. My only complain is on the really firm clamp, not really portable and could be uncomfortable after long hours listening to it. So I think it's time for me to get an IEM as a portable earphone and let M50s to be on my computer. Also, I got a Piston 2 being shipped to me atm if it matters.

Thanks in advance!

Thanks guys! auditioned SE535,215, Final Audio Design Heaven V & Aging, AudioFly AF140, ATH IM50, Westone W30 today at jaben aus. and I just checked the V6, out of my budget apparently 

So right now im hooked with either 535, Heaven V and AF140.  I was happy with the 535 but then tried the Heaven V.. And that moment there on I'm confused if I want either clarity or a well balanced sound.

Special mention to V aging due to its unique sound signature, dont really know how to describe sound as im really new at this audio thing

Yes, im agree what u said. Custom one pro bass not solid compare to m50x.  what if  DT770 + hippo cricri ?
any model from denon recommend ?

Over budget