I have owned a base prior to owning the NISMO, what do I prefer NISMO hands down. My Nismo is my dd. The stock suspension is very nice and I love it. Car feels extremely sporty, also feel every part of the road. The positives of owning a Nizzy, nice stock exhaust note, and wheels + suspension, body, interior is a huge plus, even better in the 15's from what I have seen.
Honestly the only negative complaint I have is the stock radio, might be different in the 15's, but my 09 was crap. I also agree that is could use a little more power.
Both are great but like others have stated, unless you are going to heavily mod it, get a NISMO, if you plan on changing exterior, interior, suspension, wheels, exhaust then you might be better of in a Sport. Either way you can't go wrong, its a Z. Best advice I can give you is to test drive them both, have someone take a picture of you while you are in them. Then look at the pictures of yourself in either the Nismo or Sport, once you see yourself driving them you will know which to choose, good luck and welcome
