I will be having a road race built shortly and need to decide between scandium and 7000 series aluminum. While the scandium should be minimally lighter and a bit more expensive, the main concern is responsivenenss but not terribly harsh. I would like to use for winter training as well. The size will be 51-52cm. In that size, does the material really make all that much difference? I likely will not use carbon stays since I'm not convinced they add enough if any comfort to justify the expense.