you will need the wireless part of the puzzle. This is what I have and what I would suggest, but there are lots of good options and others may suggest others.
http://www.newegg.com/Product/Product.aspx?Item=N82E16833124190
you will need to wire it up so it goes something like this:
comcast coax -> comcast modem/phone box -> wireless router -> your network
From there all of your computers, wifi devices, etc will all be able to connect to the common network.
You can always use the name "Hoes with Boats", that should keep them thinking
Edit: $50 for a WRT54GL is about as low as you see them. I would not pay much more than that for one since you can pretty much get then anytime for $50. The newegg price shows $70 until you add it to your cart.