I'd say Kerry for a second term. I don't think Hillary would win that soon. Given how much she's been vilified by the right, she would need to have a much longer tenure in the Senate. Maybe in ten years of so. She'd make an awesome president though.
Kerry/Edwards ticket will win in 04 & in 08. I think Edwards then will be the frontrunner for Pres in 12. Unless Guliani is the Republican running against hilary in 06, she gets re-elected to a 2nd term (her approval is in the 60's now) and possibly she will be a Candidate inn the Primary with Edwards, possibly becoming Edwards's VP in 12. Kerry loses this year, I see Edwards leading the Dems in 08, wither possibility of Clinton as the VP