Silly idea to get an expensive, new, fast car for your first car.
For my first car, I got a Ford KA. It's cheap (£925, full maintenance history, etc), fuel economic (averages 45 MPG, better when on motorways), gets you from A to B, and has low insurance.
I got this when I was 17, a few days after passing my test. My insurance in my first year was £1,398. My insurance in my second year, when I was 18 was £750 (with 1 year NC), and I am expecting my third year's renewal to be around or below £500 (assuming 2y NC). Because the insurance company sees the Ford KA as a slow car, they don't think I am about to go speeding everywhere, getting into crashes, or what have you. This perfectly sets me up to get a better, more powerful car when I feel the need to do so, and retain low insurance.
Ford KA:
1.3 Litre, 70hp, 4-cylinder engine
0-60: 13 seconds
Top speed: 104 mph (struggles to accelerate past 75).
Really, this is the thing you should look at for a first car. Maybe not a Ford KA (I really don't give a **** what other people think about it - girls car, hairdressers, whatever. It gets be from A to B without breaking), but definitely not a Nissan GTR. I doubt there would be many insurers who would actually insure you or anything like that.
Just for reference, my parents tried to get me added to their insurance on either their Jaguar S-Type, or Ford Galaxy. I had to be 25, with at least 3 years no claims, before they'd even consider giving a quote.