If available in your area, this is probably one of the best deals currently available. I currently use these guys and it runs without a hiccup for Xbox LIVE. They give you a free cable modem, free wireless router, $100.00 cash back, and its just $19.99/month for the first 6 months with absolutely NO CONTRACT! If you don't like it, you can switch back with no penalties...
Click here for this deal: Get COMCAST Internet