since you're in alaska, I'd say the cold weather package, a heated steering wheel is nice.
If you plan on doing any towing, I'd suggest one with a towing package, you'll get slightly higher tongue weight and towing capacity, in part due to a more robust cooling system.
My absolute favorite option is the Air Suspension. They did not all come with it, and I believe that some years it was only available with the Prestige package.
The only thing that I can say is really not worth the money is the rise-out-of-the-dash B&O sound system. The Bose system in the Prestige package can be tweaked to sound pretty good.
ask away if you have other questions, I can try and be of help. I'm pretty familiar with the platform.
-bill