Hi Jeff,
Without seeing the truck, this is an opinion with very few details. That being said, question always boils down to what are you going to do with the truck?
If I was buying a daily, this truck would have too much premium. $43K will be depreciating with every mile, arguably if it actually is worth the premium in the first place.
If you have plans to collect it because of your desire to own one of the last models you appreciate, then by all means a new one will never be that one.
But, best value will be a new one which comes with the inevitable upgrades, dealer support, and resale value that the 17 will have a hard time supporting. If you're already at $40, mercilessly beat up a dealership for the best buy possible and go for it.
If you're looking at a RCSB all these comments are mute. Scarce and guys selling know what they got. Good luck.