My vote will be the same three on the podium, but in 2010 Andy Schleck will be No. 1, Contador No. 2 and Armstrong No. 3.
Schleck impressed me this year and he'll improve a lot in 2010 considering his young age of 24 and having his own brother as a training/team partner. I think Andy has the most upside to his career at this point and had he TT'd better he'd be closer to Contador this year.
Should be a fun one to watch as the top three contenders will be on different teams and can duke it out without worrying about team tactics like this year. Just head to head.