Internet Gaming Help?

I just bought a new xbox 360 250GB and I want to connect it to xbox Live. It's in my room and I don't have a phone line in it. The modem I have is downstairs and is a Westell DSL Modem Model F90-6100 (according to the at&t website). I was wondering what I need to get on xbox Live. I think just a wireless router right? If so does anyone know a good one to use? Any help will be appreciated!