Running around in a performance car and performance bike on bald tires? I guess you should just chalk it up to a couple of lessons learned. Spend the extra couple dollars to keep good rubber under you.
I would avoid the RX7 unless you want to pay a premium to get it repaired. They are incredible performance cars but too problematic if you are used to your Z. The Cobra wouldn't be a bad choice, but you'll have to move into a trailer park so you can blend in. Lots of torque but zero class. The Supra is your best option if you are bent against getting another Z, but good luck finding a good one for under $30k. Good luck.