I know there's other possibilities to make the fenders and rack work on the Bianchi, but for around $250 I could get the Van Dessel. Then, on nice days when I'm carrying nothing into work I blast into work on the fixie (fenders, rack and all add weight). On messy days or when I need to stop at the grocery on the way home I grab the SS.

Maybe I don't need two bikes to commute with, but it just seems to simplify things.