I did almost the whole kit to my base + sport. Found someone on this forum who was selling front, rear and sides and bought it for $1600. If you want to see how it all turned out chek out
my album
Had my local body shop do the work, grand total including the price i paid for the bodykit was around $3400.
If you buy it new from the dealer or Z1, you're talking close to that amount just for the kit, excluding the wing. Then tack on another $1000-$2000 for paint and labor.
If you can find someone selling their nismo kit, that is the way to go...but that is a rare occurance