I do not have a Nfusion yet so all guessing based on what I have read so far...
For ease of a first time set up I am going to hard wire mine to the router.
Going wireless is a good idea as far as going for a cleaner look and not having to run a wire from the router to the receiver.
My main concern is the slower speed and bandwidth of wireless over wired might make the streaming of video back TO the network for DVR or streaming over the internet having trouble or compromising the video quality. I could see the wireless being ok as far as for the NUFUSION to update or get the keys for IKS though.
Like I said I am very new at the NFUSION its just a concern..need to study a little more on the topic