Forportable use Focal Listen and Fiio FD1. I recently tried K712 Pro and the DT 1990 Pro for gaming. The AKG K712 Pro are insanely comfortable and have an enormous soundstage. The Beyerdynamic DT 1990 Pro are still pretty comfortable, have a premium build, a good soundstage and insane imaging.
BeyerdynamicDT900 Pro X - excellent tune for music and acceptable for gaming. The signature Beyer tune makes them bright and too fatiguing for long sessions. FPS footsteps are clear but becomes muddy when multiple enemies are around. Easy to power w portables but improves with amplification. Good price value.
TheBeyerdynamic DT 990 Pro headphones are renowned for their precise sound reproduction and immersive audio performance. Designed for professional studio TheBeyerdynamic DT 990 PRO aren't designed specifically for gaming like the Corsair VIRTUOSO PRO are, but they're still a good choice for wired gaming. They're comfortable and more sturdily built than the Corsair and offer a more accurate bass response. However, if you need a microphone to communicate with your teammates, you'll want to opt for the BeyerdynamicDT990 Pro: UNDERRATED for gaming, editing, listening. NOTE: I'd suggest you use a quality headphone preamp with the 250ohm version of these Bythe way, like the first comment mentioned, the DT880 is better for gaming, especially for FPS games, as it has superior imaging. It also sounds more neutral than the DT990, it might fit your music genres better - highs on the DT990 might be too much for some folks. MrtROR.