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