If you are considering a wireless network you need to consider a few things. How willing are you to put forth the extra effort needed to protect your security and data?
Picture this:
You and your son are in your house, both using your computers. You are purchasing a few things online, confessing your deepest secrets to a friend in an email - whatever.
Outside your house in a car you don't notice sits someone whom's face is illuminated by the glow of an lcd laptop screen. They've just hitched themself to your wireless network, and are making records of your credit card info, collecting your passwords, reading your email, and using your internet connection to send terrorist threats to *. Maybe they are even releasing a worm (virus) into your network.
Think it can't happen? It does. I work for an ISP and we offer wireless internet service. We've got ours locked down as well as it can be - but wireless by it's very nature is insecure. THere's another wireless provider in town that isn't locked down at all. Free internet, anyone? They even have their access points set up with default passwords - anyone could log into them and change the passwords, locking out the provider completely. One of my coworkers periodically drives around with his laptop just to see what the state of wireless affairs are in the area. He's found himself with wide-open access to many home wireless networks. Of course, he's a GOOD guy and not doing anything wrong when he finds these. When in Portland a few months ago at a hotel across from a Budweiser (plant? office?) he noticed a wireless antenna on top of their building. Within minutes he was happily surfing the net via the Budwiser's network wireless connection.
If you want to do a wireless network I would advise that you familiarize yourself with how to make it more secure. There is a fairly decent article I have posted a link to below.
http://netsecurity.about.com/library/weekly/aa021803a.htm