As a heads up, I would wait on the expensive headset. Turtle Beach is starting to tap into the wireless headsets for xbox one. By this I mean that Microsoft one consoles are built to allow wireless chat and virtually uncompressed audio via wireless, BUT the current wireless headsets work slightly differently. Turtle Beach works closely (read throws money at) Microsoft and hence tapped the tech first.
Basically just wait for more companies to start toying with Microsoft's wireless tech to create better headsets.
Or you can get a astro amp then buy a good headset like audiotronics, seinheisser etc. These are really superior to almost all headsets in sound quality.
If you want a headset for FPS then an Astro 40 would probably be one of the best. Sound quality is good but doesn't match a good headset from a industry leader like the above. But what Astro did great is creating a headset that distinguished usual FPS sounds (footsteps, audio clues, gun clicks etc). IE Bass boosted, mid range distinction etc. To do this they sacrifice some audio quality.