Grundelwolf, I would stay away from wireless mouse, kb, headset if possible. The main reason is not added latency but the DPC latency on the cpu. DPC latency is CPU clock latency. The lower the latency the less the cpu has to wait around to execute. Wireless adds a lot of faults and wait states to the cpu. Many wireless devices will cause a lot of dpc latency and when that happens your machine will run in many ways under spec. You can have a killer computer but have poor performance and never know why!
I would download a dpc latency checker and test your results. http://www.thesycon.de/deu/latency_check.shtml
Things that really hurt dpc latency are, USB 3, wireless of any type, sleep states in the bios etc.
I have a dpc latency of 3ms. With 0 faults. You want to be sub 50 if you can help it.