Sony MDR-XD400. Best sound for gaming headphones in that pricegange I have ever heard.
EDIT:
You made a very bad choice. 5.1 headphones suck, they have the cheapest drivers possible. RMA them for a refund as soon as you get them. Head over to head-fi.org to ask the real headphone junkies/audiophiles what would be the best headphones for your pricerange, my vote is to the MDR-XD400.