I was a sales rep for a local dealership here in WI. I bought and sold 1000's of trade-ins. I got the chance to see what lasts and what doesn't (on a large scale). I found that no matter how many miles and appearance, cars ALWAYS break down. If the price is good and you can handle fixing or pay for someone else to fix it, buy it. If you don't want to fix up an old car, buy a new one. Have fun with your new(used) Z.