i do prefer keyboard and mouse for any game unless it is a side scroller platformer which i think should always be played with a controller, but hey, thats me.
you could always try a controller if you are used to playing games on consoles and prefer those controls over the K+M.
for decent wireless gaming K+M you will be looking at least $100 for each, in my opinion that is if you want something good with minimal latency.
right now hooked up to my 40" tv i have a wireless keyboard but use a wired mouse and wired headset, normally when im just browsing ill just my phone as a touchpad and then keyboard for typing, but while im gaming ill sit at the coffee table and stretch the corded mouse and headset along the floor. if i require extension usb cables i normally will plug my mouse in to the USB3.0 port to get a little extra power, but my headset has 3 meters so that is no issue.
so one solution is extension cables with a powered hub even if you wanted to go with the less latency route but then you deal with cables running everywhere.