If you use a wireless, be VERY SURE that you set up the WEP password on your router!!
An unsecured line can be hacked by anyone driving by, and if anyone managed to sneak a backdoor on your computer via email or a website script (I catch an attempt on my system at least once a week if not more often, you are especially vulnerable if you cruise a lot of investor information sites), you leave yourself wide open for loss of data/info also.
Every time I turn on my laptop, sitting in my family room, I can pick up on up to 10 different wireless networks in my neighborhood, most of them open (because lots of people now use the long range N1 routers, the network pollution is even greater).
If they are set up for file sharing, I could log on and possibly see their shared files on their computers!!! Most people don't even bother changing their router default passwords! Someone could log in, change their passwords and lock them out of their own network permanently!
So if you go this route... read your documentation, it's probably the most important thing you will ever do for your network is to change the default password and set up a WEP encoded network password. ESPECIALLY if you are planning to use it to access financial data on.