Porsche have always been good at making the chassis and suspension mounts strong so the energy goes into the spring/damper and not the body. I remember the 968 Club Sport I had years ago. For a modest power you could make very impressive progress.
As for the seats being a bit naff. Well that's just another reason to have a HUGE options list which they certainly do.
I would go for an S model as the engine is more responsive in the upper range and so much more entertaining to push along.
I would look for a model with the extended leather as it makes the interior feel a lot more Porsche level.
I am not certain I would have a four pot. I love Scobaru's flat four noise but don't want it (reduced) in a Porsche. It needs that smooth six.
Unless the soft top is a must do look at Caymans as they are not as popular and often you can find a better value car as a result.