I have read a ton of info on all years of the Boxster and it appears that the 06 model year may just be a smart choice possibly over some of the other years.
Reasons: Last revision of the IMS bearing (not seeing any issues)
Last year of the 3.2L engine which was in production for a long time and was well tuned and the highest HP and Torque for that motor.
No Bore scoring issues that I have read about.This seems to be a problem with the 3.4L that was launched in 2007 ( I read that Porsche in addition to bigger jugs made revisions to the cooling system
that created even more issues mostly on tracked cars but also some daily drivers.
2006 had a different (superior )coating and material of the pistons and different coating on the cylinders. 2007 changed to a cheaper coating material obviously to save on cost.Jake Raby mentioned this in a post I read.
Please feel free to correct me on any information mentioned. Yes your wondering what year I have and yes I purchased this year due to everything I have read.So far with almost 100k I have experience
no issues other than routine maintenance.I do drive it hard but no track time.
If I had the cash I think I would purchase a 987.2 as there looking pretty good long term with lots of miles on them.