Remind me why a Boxster doesn't fit the bill.
You have a point. Maybe a 996 turbo? How electronic are they?
How about a bit older and not as fast but fun - TR6 for example - really mint older car.
Did the Triumph bit earlier - I did say something reliable, that isnt a rust heap and has 300bhp/tonne or thereabouts. A TR6 fails all three
Buy a banger and rag the ass of it. Stop the constant analysis, let your hair down and have some fun.
No hair!