Well here is what i found out doing a little testing of my own.
All test were done from stock as bought cars with only the driving aids all off, I did three laps around Depp Forest and the best was the taken lap, then i did a top speed and 1/4 mile speed test which i hovered around the 5000rpm mark on the rev counter and floored it from there. The power is show in two different measuments (S) is what is shown when you buy it (S)=shop, and the (G) is what is shown in the garage (G)=garage.
All test were carried out using the DS2 with Automatic gears and the laps around Deep forest were just 3 laps i know that some people will be able to get faster times with the same car i could but in three laps they were the best.
I wanted i can redo the laps tommorow with the DFP and compaer but i will leave that upto you guys.
Car: GT-R M-SPEC
Price: 59,500cr
Power: 276bhp(S) 331bhp(G)
Weight: 1560kg
Time (Around Deep Forest): 1'27.598
1/4 mile: 0'13.405
Top speed: 169.65mph
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Car: GT-R V-SPEC II
Price: 57,480cr
Power: 276bhp(S) 331bhp(G)
Weight: 1560kg
Time (Around Deep Forest): 1'27.054
1/4 mile: 0'13.312
Top speed: 169.68
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Car: GT-R V-SPEC II NÜR
Price: 61,000cr
Power: 276bhp(S) 337bhp(G)
Weight:1560kg
Time (Around Deep Forest): 1'25.702
1/4 mile: 0'13.233
Top speed: 170.49mph
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Car: GT-R
Price: 50,480cr
Power: 276bhp(S) 328bhp(G)
Weight:1540kg
Time (Around Deep Forest):1'25.977
1/4 mile:0'13.398
Top speed:169.34mph
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Car: GT-R M-SPEC NÜR
Price: 63,000cr
Power: 276bhp(S) 336bhp(G)
Weight:1580kg
Time (Around Deep Forest): 1'24.846
1/4 mile: 0'13.209
Top speed: 169.13mph
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Car: GT-R V-SPEC N1
Price: 60,980cr
Power: 276bhp(S) 328bhp(G)
Weight: 1550kg
Time (Around Deep Forest): 1'25.220
1/4 mile: 0'13.390
Top speed: 168.30mph
For me the best of them all is the "GT-R M-SPEC NÜR" as this was nicer to drive, and the worst oif the bunch for me was the "GT-R V-SPEC II" as this just understeers like a pile of cr*p.