@ymmv,

I have a different opinion.

In the long run, a 2006 Cayenne will be viewed as 2 years older than a 2008 Cayenne to a second hand buyer, but not just a few months older.

I have compared the new CTT and a new 2006 CTTS. Even with big discount on CTTS, the new CTT is still a more attractive buy for me.