Help me compare finance quotes

[matrignano]

Looking at a £70k car, thinking of dropping a £20k deposit.

Got the following figures (best of what I received so far in terms of total cost):
36 months PCP: £903.73pcm + £27,476.25 balloon, 8.6% APR
48 months PCP: £859.92pcm + £20,825 balloon, 8.5% APR
60 months straight finance: £1,017.45pcm, 8.5% APR

So cheapest one is 36 months PCP, BUT - is it a good deal?
Is it worth putting in less/more deposit?

Bit of a noob when it comes to finance.
All I want to make sure is that I don't end up in negative equity (I expect car's value to be £35k trade-in in 6 years time).

[matrignano]

Thanks, should have specified the car is 2 years old and was 100k new.
If I look in the classifieds for 7 year old models they retail around 35-40k.
Maserati Granturismo for what it's worth

[matrignano]

Thanks all, that's very helpful.
In reality I probably wouldn't keep the car longer than 3 years so the above scenario is very applicable.

All this just made me realise how much I'd be hit by depreciation! After 3 years I'd be left with very little equity to "reinvest" in another car.

So now I'm wondering whether I should get that Gallardo I've always wanted... Start at £70-80k but unlikely to depreciate massively more in the next few years?