Hi,
I would have to agree with the maintenance issue. If the issues on your car have already been addressed and from what you said, much of the mileage is from the highway, then I don't see why your car wouldn't go well beyond 150K.
As for the possible suspension / rattling issues, those may may be easily taken care of by you and / or by your trusted, fair, and relatively honest porsche mechanic.
But, all of this is, IMHO, isn't really all that helpful considering you know your car the best...you drive it everyday. If you feel uneasy with a higher mileage car and you can afford to take the plunge again, then maybe that's the best way to go.
Lastly, I think you raised a good point about a lower mileage boxster. The next car you buy may have those issues we all know and love and love to hate.
But since you've been there already, you'll know what to look for---just make sure you get a PPI.
Good luck Dixie!
