[Alyus]

I would like to spend less than $100.00 USD. I do already own a pair of Sennsheiser HD 598 and a Schiit Fulla but I don't consider them portable. The HD 598 lacks deep bass for me but I like the mid and highs, not that I am an audiophile.
 
The Sennheiser MX 686G is $39.99 now. The majority of places sale them for $69.99 (I guess this is the retailed price) There are too many headphone options. Perhaps someone with experience can give a recommendation. Although I place the limit at $100 USD, under $60 USD would even be better. 

 

[cel4145]

Check out http://theheadphonelist.com/headphone-list/. IEMs are ranked, and each make/model leads to a review.

Penon Audio is a good international vendor for many IEMs: http://penonaudio.com/Earphones/In-ear-earphone