Just bought some Nitron Fast Road NTR singles and I'm deliriously happy with them! I was concerned with the shorter bodies about not getting enough street ride height, but no concerns, as I'm at about 132 mm even. Ride motions are so much better than stock Bilstein/Eibach setup, and I have the ability to firm up for track days. The Nitrons come only with droop springs for the rear, but it seems that's where they're most needed.
My advice, respectfully, would be to wait. These cars have so much handling potential right from the factory, money is better spent on HPDE sessions. Learn to master the tools of the car first, then upgrade.
I did a Nitron Street series upgrade, more for the ability to soften the ride on the street, then tighten things up a bit on track. After a half a dozen or so track sessions with stock suspension, I went with the Nitrons. 2 years and 12+ more track days later, I'm still the limiting factor in the lap time equation.