Anyone recommending no soundstage Crackhiesers for gaming should GTFO.
Anything short of the hardest to drive headphones should be fine on cheapish dac/amp.
https://www.amazon.com/dp/B00DI33YNQ
https://www.amazon.com/dp/B06X9MB1XW
https://www.amazon.com/dp/B071XTCRZD
For general purpose listening i love my Audio Technica ATH-MSR7BKs with lamb leather Brainwavz pads. Can listen to them for hours comfortably. Extremely easy to drive (can be used comfortably from a phone), wide soundstage (for closed backs), decent imaging, solid but not exaggerated bass, detailed but not sibilant highs, and compatible with the v-moda boompro. Not the BEST at anything but extremely well rounded.
https://www.amazon.com/Audio-Technica-ATH-MSR7BK-SonicPro-High-Resolution-Headphones/dp/B00PEU9CFA
For pure competitive gaming and analytic listening i recommend the Audio Technica ATH-AD1000X/2000Xs. Both are easy to drive, extremely comfortable, VERY detailed, and have soundstage and imaging i havnt seen from anything less than high end planars.
https://www.amazon.com/Technica-Audiophile-ATH-AD1000X-Open-Air-Headphones/dp/B009S330O8/ref=sr_1_1?s=electronics&ie=UTF8&qid=1511481661&sr=1-1&keywords=ath+ad1000x
https://www.amazon.com/Technica-Audiophile-ATH-AD2000X-Open-Air-Headphones/dp/B009S32ZPI/ref=sr_1_1?s=electronics&ie=UTF8&qid=1511482064&sr=1-1&keywords=ath+ad2000x
Good bundle deal on a DAC/AMP and some BeyerDynamic DT 1990 PROs.
https://www.amazon.com/Beyerdynamic-Studio-Headphones-Slappa-Accessories/dp/B01KMWRZ0S/ref=sr_1_2_sspa?s=electronics&ie=UTF8&qid=1511482292&sr=1-2-spons&keywords=dt+1990+pro&psc=1
The best way i could describe the BeyerDynamic DT 1990 PRO is VERY German.
These sound excellent for the price and are a excellent entr into planars if you are willing to deal with some build quirks.
https://www.amazon.com/Monoprice-Monolith-M1060-Planar-Headphones/dp/B01N32N5DD/ref=sr_1_12?s=electronics&ie=UTF8&qid=1511482451&sr=1-12&keywords=monoprice+headphones
I heard GOOD things about the Fostex TH-X00 Purplehearts. Plan to get myself a pair eventually.
https://www.massdrop.com/buy/fostex-x-massdrop-th-x00-purpleheart-headphones
I could recommend some endgame cans (think $800+ and requiring a high end amp) but this being your first set of high ends these are all good entry points.
Note:
Sennheiser anything and Audio Technica ATH-M50Xs are HIGHLY overrated.