[Perfectlap]

This is what I would do.

Start with a Miata, get some sticky tires for the track. Learn how to drive the car, which will be a lot more fun since the limit is much lower. Also the cost to do upgrades is very cheap and you don't need a master mechanic to work on the car.

Then after you've worn out a few sets of tires consider upgrading to the Boxster S, one with the IMS bearing already replaced and with a good record of frequent oil changes (every 7 or 8 months).