Hi.
My answer used to be: < $100? Turtle Beach, whatever you find fancy. > $100? Sennheiser HD 555.
And then Turtle Beach completely changed their builds and Sennheiser products jumped $70 in price. The older Turtle Beach stuff has been tried, tested and 47Ronin approved for years. The entire CS:S community has tried, tested and approved of the Sennheiser HD 555's...to the extent that the CAL forums became a fan boy forum for them.
I say you buy the
Turtle Beach z6A and tell us how you like it. You'll appreciate the included splitter cable so you can use your headset or desktop speakers at will (without diving behind your comp to change wires).
I have used both the Turtle Beach HPA1 and Sennheiser HD 555 for a long time now.