Sounds pretty reasonnable to me. If it's not sold by an official dealer, then you could probably take it down to 80k.
Depending on the condition of the car, I would actually highly consider it. Definitly not as good as your future GT3 but arguably more desirable, certainly more beautiful and more passionate.
Same old story, heart vs brain.

Just to give you an idea, an immaculate 360F1 at the Paris delear (Levallois), 2000 metallic black, tan interior, full leather incl. roof, superb (I saw it) GPS, Xenon and bucket seats. 5000 km in other words new, was exchanged for a Stradale by its owner who is meticulous about his cars.
Was 120k Euros!!!

Steep! But Factory warranty for one year.
Now it's 115k. I reckon that puching it, it would go for 110k, so way more than yours at 85k but, it's gorgeous, it's loaded with options, and it's almost new (5000kms, new gearbox, new tyres etc.)