NA skylines are as boring as bat sh!t, they will only leave you wanting a turbo. I had a drive of an NA Autech S15 the other day and that was a great car! (granted not as nice as the turbos) Light, and with decent power to learn with one you put an exhaust and a cold air setup on it.
You get a great chassis, gearbox and suspension setup with plenty of power to learn in. Plus you can make S15's look sexy as!
If i had a kid who wanted a sports car, I would be buying them an Autech S15 to learn on.