I wouldn't say wireless or cat 5 is purely preference.... there are (at least in my book) some serious security issues with a wireless network. I know there are people who will say that wireless is secure because it checks mac addresses and uses encryption, blah, blah..... but I follow the principle that if it can be made, it can be cracked. Those mac addresses or anything else can be spoofed.

If there's a good reason to go with wireless, then by all means look into it. But in the absence of a need I don't see any reason to broadcast your traffic all over the neighborhood, encrypted or not.