Some of us 18/19 year olds are too young for insurance companies to want to touch, so an N/A is the best option.
As to your 'poser in a line' comment, keep them to yourself mate. I would rather be seen in a non turbo R34 than a Mazda 6 or something equivilant, and that's the option I was faced with.
Whose to say there aren't posers who drive our turbo counterparts? Your comment has me wondering if you would fit into that very catergory.