the vast majority of people I know even on non g20 cars use the Eibachs with the KYB AGX. I mean with the Pro Kit cuz its only a 1.25" drop you could go withthe Gr-2s and you shouldn't have to worry about ride stiffness
The agx run around 300 and the gr-2s around 230. That's what my aftermarket store gave me for prices
keep in mind they don't make agx or gr-2s specifially for the p11.
You would have to the the front 91-96 g20 shocks and the rear nissan sentra Se 98 shocks. i believe thats it