Tom Brady Injury- Fantasy Football Impact?

Unfortunately for my fantasy football team, my 1st draft pick in Tom Brady went down in Week 1, out for the season. I'm not sure what i should do. My backup QB is David Garrard. I know I should probably drop Brady--it doesn't sound like he'll be back even if the Pats make the playoffs. Should I start Garrard? The best ranked QB in the FA pool is Aaron Rodgers. Should I take him, or Cel? (he's a free agent too). Dante Culpepper's name (and history w/ Moss) has been thrown around, should i sign him? (FA also). Answers would be greatly appriciated.