[Eviltwin678]

I don't know much about the original Redlines, other then they are very pricey. With one-off prototypes not included, what is the holy grail produced Redline?

That would depend on several factors. Are you talking about loose castings or carded? And cars that are a certain color come into play as well.

 

[Eviltwin678]

If you are talking about overall by casting, not taking into any factors such as "painted/unpainted roof", short run variation such as "Cheetah base", and color such as the "Enamel White Camaro"... I would say the Superfine Turbine from 1973.

That is a very good one, those castings are very tough to find and go for a lot of money. Then you'll get collectors who say that the Turbine isn't a true Redline, it didn't come out in that '68-'72 time period and it came out when all the castings were done in enamel and so on.
To me it is a Redline and like I said, a tough one to come across no matter the condition.