Here's the geometry on your bike and that of the specialized. The reach on the Specialized would be 2-3mm longer than you current frame. Since you have the Bianchi in hand, you can compare the head tube lengths. Then there will be little to guess about with regard to the stem angle and spacer setup.
http://www.bianchiusa.com/04_giro.html
http://www.specialized.com/bc/SBCBkM...=39243&eid=115