When I ordered my car, the carbon ceramic brakes were, quite literally, a "must have" option: the base steel rotors weren't available at the time. So I had to order the CCBs. However, they are far from being truly must-haves. There are advantages and disadvantages of both. For the steel rotors, beware that the pads apparently have a high iron content, and there have been a few complaints of the pads sticking to the rotors after getting them wet. The downsides of the CCB are higher initial cost, higher replacement cost, and also more costly service. Rotor thickness is not a reliable way of determining if a ceramic rotor is worn. You have to weigh them, which means they first need to be clean and dry, and that adds time (and therefore cost) to the brake service. The CCBs will still wear out when used aggressively such as on a track. They may last a bit longer than the steel rotors, but the higher replacement cost will negate that advantage.
Really, there are no mandatory options for this car. However, the option that I highly recommend is the Andaro paint. Beyond that, if you are in a position to have one BTO, do it, and pick the options you like.