If its the Boxster, I would look for something with less miles if possible. Nothing wrong with high miles, its just with lower mileage cars its less expensive to maintain and a more enjoyable ownership experience due to not constantly being in the shop needing this or that. The Carrera is a great car and values are going up due to it becoming a classic and its the 50th anniversary of the 911. IMHO for either car, be prepared to pay to play, especially with >100k in mileage, alot of things needing replacement. Having bought over 28 cars thru the years from Beemers to Benz and Porsches to Ferraris, I would say buy the best example of the car you can afford. Looks like you already made up your mind on the 987 ! Congrats, it does look good!
btw, carfax report of this car:
http://www.carfax.com/VehicleHistory/p/Report.cfx?partner=LMN_0&vin=WP0CB29815U732049
Cheers and drive in good heath!