Always a fun time picking out your first "serious" headphone setup!
I've been through many iterations of portable studio setup to help with my quick vlogging edits on the road, and I ended up settling for a pair of these https://www.amazon.com/Samson-SR850-Professional-Reference-Headphones/dp/B002LBSEQS/ref=sr_1_20?s=electronics&ie=UTF8&qid=1480366877&sr=1-20&keywords=open+back+headphones with my focusite 2i2.
Incredibly affordable and really fantastic response for audio editing. Hope you find your first pair!