Wherever I read (since I'm looking for headphones/headsets too), it is said that anything sporting positional audio by simulation or real multiple channels is to be avoided, as it's just a gimmick. I find that a bit overzealous and prone to misunderstanding after 3 years with a CM Storm Sirus 5.1...oh well, opinions.
Anyways, they're a bit over your budget, but I'd recommend stretching for the HyperX Cloud II. They're pretty awesome for the price, at least from what I read.