Certainly not a Tyrannosaurus!
Maybe a Brontosaurus!
Seriously, if you are buying a car as an investment, you should, for the most part, consider another avenue, IMHO. Remember the spike in Ferrari prices? They dropped much faster than they ever rose.
Kinda' like the price of gas: it can go up in an hour or two
(NEWSFLASH: "The cost of oil is going up!") but it takes weeks to go back down...
If you are purchasing a car to USE, to drive, enjoy, maintain..
Yes, even to BABY & to CHERISH, then such mundane concepts as ease of repair, original cost, actual purchase cost, cost of parts, AVAILABILITY of parts, etc. should come into the equation.
I should also have added "available room to store spare parts, parts car, etc." Much easier here on the Left Coast than in NYC, or London, eh?
For my money the 116/126 models provide significantly more of the above mentioned positive attributes than the 140's. The fact that a lot were produced may prove to be of benefit vis-a-vis the 140's in the future, but right now you can buy quite a few decent, running 126 cars for what a single bargain-priced 140 will cost.
And you can actually work on them, which to me is half the fun!