I'm with you, Jeff. I would have to keep my car for another 100 yrs to see its price rise to match what I've invested in it. But fortunately I didn't do it for the money.
As for Vipers and Z06s, they're nice reliable performance cars and are great fun to drive. But they don't come close to the Pantera. Neither does anything else.
Like a friend of mine said while scanning all the Ferraris and Lambos at Monterrey "...they look like a box of Smarties spilled out in the grass - all exactly the same, just in different colors."