Wait .. you're paying an extra $8/mo difference for the wireless versus wired? You're getting hosed, man. It shouldn't cost you any more - as long as the signal is coming into your house, that's all that the company can tell (unless you signed up for multiple IP addresses, which shouldn't be necessary for a home network).

When I sign up for cable internet (soon), I'm going to obtain a used modem from craigslist, which saves me $3 in rental fees. It's not difficult to set up a home network by yourself, the 25-page manual that comes with any router or access point more than does the job explaining things simply. Plus you have the added benefit of being able to run the wires along the walls yourself without having to deal with legalities (this is necessary in an 80-year-old building!)