[Perfectlap]

well I would suggest getting a set of smaller wheels and of course less expensive tires. 19" Tires are pricey for sure. Now does that mean you will shred them at your first track outing?
No. For a first time event your seat time will be very limited.

Could you shred your tires in one Autocross? Definitely. Particulary super sticky r compounds in high heat and on a ****************ty course pavement full of gravel.

It's two very different approaches to high performance driving.

Autocross really throws allot of driving customs out the window, where on the track you are using the momentum of "racing lines" to limit your braking,
in Autocross you are using abrupt bursts of acceleration to cut the shortest distance between points.

in my opinion, its much harder to be quick in Autocross than on the track. And your driving skills in general will get much much sharper at a proper Autocross venue after say a dozen events then a similar amount of timed seat at the track.
Reaction skills become VASTLY improved which translates well on the road in avoiding accidents.

Now that being said, Autocross doesn't work well everywhere. If your local clubs have these mickey mouse courses where the cones are never more than 6 feet apart from each other and you are never going straight long enough to get over 75mph then its really not so much fun. Don't worry about it "only being 2nd gear" most people have no idea how fast a sports car will go in 2nd gear. Its really the workhorse gear. Take your car to 75mph on open lot and knock out a hard right hander and you will swear you were going 150mph.

do the DE with PCA, its not so much a question of whether it will be worth the expense but more an issue of whether you will wish you had never done it all because you'll feel like you are wasting your Porsche just driving to Starbucks everyday.