Funny no one has mentioned the Boxster. The balance is impeccable, it is much more forgiving than a 911 and the power of the S model is more than enough... and it is a cabrio

Get a less powerful car and learn to drive it 100% to the limit rather than, for example, a GT3 which most of us will never be able to drive more then 70% to the limit even after many years of track experience. Not to mention the likelihood of ending up in a serious accident while trying to push the GT3 to the limit...