I agree with dropping Balfour for Baez, but I'd hold onto Rios if this is a dynasty-type keeper league. He's gonna be special.
If possible, I'd drop Mora and pick up another SP or Everett. With Larry Walker's health, one more OF'r can't hurt. With A-Rod, Cintron, and Upton you're set at SS for the next 15 years. Mora's expendable.