I need gaming/music headphones 800$ budget

I need an amp/dac or sound card under 350$ for my philips fidelio x2 headphones.   I listen to mostly electronic music and I was hoping to tighten up the bass and add some punch.   I use the headphones for gaming as well.

I need a recommendation for an amp dac or sound card for my fidelio x2 headphones. Budget of 200-400$ It's mainly for computer use. What would give the biggest sound quality improvement and maybe some more bass punch?

Which has best speed, bass mids etc?

I think i have a solid budget but i need recommendation for headphones good for hardstyle, hiphop, trance.   Also, for a little bit of gaming and studio work. I like bass also. I was looking at the x1's but I feel like i might be under selling myself. Any other recommendations?

Which do you prefer and why?

Which would be better for faster electronic and hiphop music? And a small percentage of gaming Also, what amp do you use?

Which would be better for faster electronic and hiphop music? Also, what amp do you use?

These two headphones have many similarities. Has anyone tried both?

What do you prefer if you tried both? Also amp or no?

For electronic music and some gaming/home use?   Also amp?

What are good headphones 300-500$ for electronic music and some gaming/home use?   Open or closed doesn't matter to me. But I like a good sound stage and some decent hitting bass.   Please help with a few recommendations. 

Mainly used for electronic and hip hop music

I have a budget of around 200-400$. What are the best headphones i can get for that. I listen to all kind of music especially electronic and hip hop. I also do some music production and gaming.   Any recommendations?