I'm completely new to the whole hi-fi audio stuffs. Just recieved a Beyerdynamic DT 880 250 ohms Premium to primarly use for music and gaming, home only. I plugged it in onto the back of my computer case/ motherboard, and quite dissapointed on what I hear. These cans seem to not be powered...

I'll spend $200-$300 MAX, but preferably $200. Headphones (Over the ear) along with a portable amp. I mainly listen to EDM, Rock, Metal, Screamo. Not sure which pair to get since so many are recommended or common: Senn-Heiser, Bose, Audio-Technica, etc.. Something with decent bass, sound quality...