You should be familiar with what size bike you need before spending the kind of money
the Colnago Name fetches ..
have you analyzed whats wrong with what you ride already? 59 from 61 It's only 2 cm smaller .
and the Current race posture is low on the front . so why not go with the shop suggestion where they saw you .
did you ride one, there?
I used to match the top tubes on my bikes , which are decidedly un racer style by todays standards,
sloping top tubes just require more seat post out if the seat tube is shorter.