are you confused? on what a bianchi pista and a bianchi pista concept is?
bianchi pista is STEEL and is $450 complete.
Bianchi Pista Concept is ALUMINIUM and isnt just $450 complete (complete no longer exists and also its now called Bianchi Super Pista)

you are, aren't you?

get a bianchi pista if you can find one your size selling at $450
if not > going back to buying a kilo tt is never a bad idea.