Not entirely relevant to the two cars, but mainly from my personal experience...
Have you thought about maybe a truck? If your BRZ is going to be a dedicated track car, you may want to look into one... I mean HOPEFULLY nothing would ever happen, but when driving your car hard at the track, you never know if it'll make it home mechanically or cosmetically. Very beneficial both physically and in the "mental peace of mind" department. I understand your choices, and not everyone needs a truck, but just food for thought.
I thought buying my truck was going to put me asleep, but in reality the only thing I hate about it is the MPG (which I deal with as I know the kind of vehicle I'm driving.). It's only duties are DD'ing and towing my old cars around, although I've already noticed how useful it is in everyday life. Plus, the mothertrucker SCOOTS when you put the pedal down.
Now, to stray onto the topic, I've always been VERY interested in the abarths, and I think for a daily, you couldn't go wrong. Why buy a track car, when you have one in the garage
Just my .02
EDIT: Also don't forget, maintenance comes with porsches (yes, I understand all cars need to be maintained.) hand in hand, otherwise you'll have a fancy paperweight