In the US, Dino prices have been running up with alarming speed.They seem to have settle for the moment.
Here's wher I peg the current market in USD.
Model Fair good Excellent Perfect (98 points)
246GT $70,000 $90,000 $125,000 more
246GTS 85,000 110,000 $150,000 Sky's the limit
Add about 5% for Flares and another 5% for Daytona interior.
Pricing for excellent assumes car is mechanically perfect, might have some small (under $5K total) issues you want to attend to. Also assumes complete books and tools as these are getting VERY pricey indeed to add after purchase.
Bigger problem is getting the folks who own a car in only fair condition to admit it. Once prices start to run up, everyone thinks they own a $100K+ car.
Oh, and having done it myself, it truly is cheaper to buy a well sorted car than to sort it out yourself, UNLESS YOU STEAL IT!!