Air cooled Porsche becoming very collectible but what model

[jake-gq0ps]

I've been doing a lot of research on which model to invest, I've listened to some of the most influential people in the Porsche world who all seem to suggest the same thing,the car must be an original uk car, matching numbers and as original as possible which seems common sense, now taking the early turbos, 911s and the rs versions out the equations which are well out my range the big wigs seem to be pointing towards the early 911sc's especially the 3 litre model from 1978 to1983, this is apparently purely because of the lack of cars around of this age and because of the actual amount of cars produced for the uk market in comparison to the later 3.2 cars, it also seems that the coupe version is the most desirable version by far especially in uncommon colours such as guards red.
I've looked around and basket case cars are tend to start around 25/30k up to mint examples in excess of 90k.
Any thoughts or advice welcome.....