Help me find some decent audio hardware

Hello again /tek/

Let me start by saying I dislike spending money, so when I do decide to buy something it either has to be good for the money or the best available. For me, choosing other parts like monitors and computer parts is easy because you can look at other peoples benchmarks and FPS in game.

The problem with choosing audio stuff is that it means nothing to me, all this about 24hz - 100hz etc. Another problem is that one website says it's great, then another says it awful. So my budget is £100 which is about $155. That is either for a headset with a mic or seperate headphones and a seperate microphone. 

Can someone with the correct knowledge please help me out? I was thinking about getting the Roccat Kave because it has real 5.1 surround sound and could be plugged into the sound card I plan to buy. Will the 5.1 be better for gaming and movies that just regular headphones? I play a lot of Dayz so directional sound is important to me.

If you plan to help out, please give me a few options and why that choose is the best.

Thanks so much