I will probably be corrected but I believe the IMS issues are present from 97-08... but in 06 they changed the design so the bearing cant be changed like it could prior to 2006. Only way to change it on MY06-08 is to split the cases on the engine. I would lean towards an 09 if you're going to go to the newer 911. As far as the seat goes; personally I think the back seat is ok for a kid but once they turn 16 they may just want to sit in the driver seat
