For the record, no need to jump on people who, all things equal, would rather Lee to Beckett, because he's clearly been the better pitcher for the last two years, i would personally be happy with either, but given age, contract demands, and familiarity with the team, Beckett is probably the way to go, my argument is that trying to state that Lee is the better pitcher, even if Beckett is the better fit for the team. Fire away.
Excellent point by Crunchy about contract issues.