Owners will always deny that their vehicles depreciate as much as what KBB claims. Its a bit aggressive, but I wouldn't be suprised if KBB was +/-2k off. I hope KBB predictions are correct because I would be able to pick up a Z for 20k next year.
I've also kept my eye on 350Zs, you can get a low mileage 06-08 touring/enthusiast for 18-22k...well that's what carmax says...so maybe?????
Car Finder by Zip Code at carmax.com