WIRELESS QUESTION: I've never tried a wireless keyboard / mouse... it is something you could definitely ask about when searching.
TRADE OF SERVICES: Isn't the underground, tax-free economy great! Don't underestimate yourself. The average person is afraid of messing up with the law (which is why lawyers are paid as they are), afraid of guts, gore, and an inability to recover from illness (which is why doctors are paid as they are), and afraid of messing up their computers and losing "all their work" (which is why computer people are paid as we are). Never be afraid of trading something like defragging/reconfiguring a PC for a "take two aspirin and call me in the morning if things don't clear up."
UNREQUESTED CARPAL TUNNEL ADVICE (hope this isn't unwelcomed):Concerning the carpal tunnel, try and sit with your elbows at your sides and your forearms parallel to the floor. Also don't be lazy and drop your wrists to the keyboard no matter how long you are sittign at your PCs. It is best to keep the back of your hands in line with yoru forearm and the thumb side of your hand in line with yoru forearm as well - just as if you were going to make a martial arts punch.
Apart from that, just try and be good (with your wrists/carpl tunnel that is *WINK*).
PERSONAL OBSERVATION: I find that if I spend too much time driving (I average about 14 hours per week just for my home/work commute though my record worst one-way home/work commute was 4 hours and 20 minutes due to a snow storm) and don't follow these same wrist elbow suggestions my own wrists will become sore and painful. Hopefully you don't and won't have this problem.