My opinion -
Pick a reliable provider with good transmission quality and the speed you want, then just quit worrying about pricing - there are always slightly better promotional (limited term) offers out there, but you cannot just keep jumping around, especially if it means new phone number and eMail address.
Your best deal will almost always be by combining all the services you use into one bundle - TV, phone, cell, and DSL internet/eMail. When you sign up, check the competition - almost all providers will match their competitors deals at signup.
As time goes on, if competing prices go down, talk to your provider - they may match the competition.
