By JIM VERTUNO Lance Armstrong is planning to ride in the Giro d'Italia in May even though his broken collarbone is a bit more serious than first thought."I think the Giro is still very doable," the seven-time Tour de France champion said Tuesday night during a conference call with reporters.Although initial indications were it was a clean break, the 37-year-old American cyclist said new tests in Austin on Tuesday showed "multiple pieces" of broken bone.He will have surgery Wednesday, and Austin sports medicine specialist Dr.