I have two more events in Battle Italia to complete.  Both are Cup races, one with a PR of 60, and one with a PR of 62.

My Aventador and F12 are fully R$ upgraded; the Aventador has a PR of 59.5, and the F12 has a PR of 55.8.  Obviously the cheapest way to complete the series is with the Aventador.  But I think I want to upgrade the Ferrari, instead.  Hmmm....