You are an ideal candidate for a CPO Boxster.
You can buy a 2001 Boxster with a CPO warranty for around 22 500$ if you negotiate with the dealer.
That way you are protected against pretty much everything related to the engine for 2 years.
search for a cpo car on
www.porsche.com
I have a 2000 Boxster S with CPO warranty and the extra 2000$ I spent has paid for itself already with all my trips to the dealer...