$55k for the one I found which I though was good buying as it was such a well presented car. Interestingly, at the time I noticed M3R's were moving at about that price too as I was considering building one of those instead, but with a 3.4.
Alan Horsley reckons less than 15 real SP's are still about and most of the cars he hes for vertification pre-sale are usually just well done knock offs.
I reckon a real SP, like ADM R32 GT-R would be a genuine investment.
Primarily this car will be used for state series circuit racing in Tasmania (Targa class). I'm keeping it twin turbo so it could be used for tarmac rally, but not that fussed as wouldn't be very competitive.
I intend sending it to Sydney to do some events for fun too and try out tracks I've not been to.