I am afraid to say, there isnt a chance in hell i would spend 20k on a 350z.
That's absolutely fair, but what could you, or would you get for 20k instead? I really can't think of anything I'd prefer until you get up to £40k to be honest.
Dont get me wrong, i agree in principal, when i had my fi zed i really had no intention of changing as i was the same, there was nothing i wanted sub £35k, so i am not going to say, buy this or that as there is loads available for sub £20k and no matter how much i loved it and if even if i had £20k budget, i still wouldnt pay that for something that can be bought for roughly half.
I fully appreciate the journey can be half the fun though and if you can afford to loose £10k go for it, but just think that is 25% of the money away from where you need or want to be (40k), so if your goal is own a fi 350 just go buy one and put that money aside for your £40k goal, if your goal is to enjoy the journey, get spending