Well after a bit of work and thanks to the leaked video of the entire GT6 Garage (at least until the first Patch) I now have what I believe is an accurate PP list for GT6. I have used the knowledge of how much PP a car gains (and comparing against similar PP cars) from the dealership. I have updated the Known PP and am working on a GT 6 Known PP (please do not adjust that page). I have PP values for every car except the 15th Anniversary additions and a few odd cars here and there.
Any value that has not been verified but is an estimate is listed as "Guess" I am 99% sure that these values will fall within 1-2 PP of the actual value of a broken in car as long as the PP is under 600. It seems some of the high power cars have bigger gains. If you are going to run a car with a "Guess" value please post in the thread the state of your car and its PP so we can get the PP verified. We have 250 (275 with the 15th versions) that are listed as "Guess" but most of those are high PP cars I never bothered to get values for or the new cars.
In regard to the new cars I did some price checking on the PP favorites
22k - Toyota MR-S V Edition (6MT) '02
23k - TRD Celica TRD Sports M (ZZT231) '00
30k - Subaru BR-Z S '12/Scion FR-S '12/Toyota 86 GT '12
41k - Audi S3 '02
46k - Renault Sport Clio Renault Sport V6 24V '00
50k - Mugen MUGEN S2000 '00
75k - Spoon INTEGRA TYPE R (DC2) '99
78k - Peugeot 205 Turbo 16 '85
78k - RUF 3400S '00
114k - BMW M3 CSL '03
115k - Renault Sport Lutecia Renault Sport Trophy Race Car '00/Renault Sport Clio Renault Sport Trophy Race Car '00
118k - Honda INTEGRA TYPE R (DC5) RM '04
125k - TRIAL CELICA SS-II (ZZT231) '03
143k - RUF RGT '00
160k - Ford RS200 '84
The total value is roughly 1.2 million. It looks like there will be no cheap cars so buy your cars wisely and take advantage of the 15th anniversary versions
Of course all this could change with the day 1 Patch