S4 is a great car, my friend has on 07, loooots of work done to it, and another friend who has a '10 rs4.
The Z is different. My friend with the S4 loves being in my car, we went to an audi meet in Baldwin one nite, and everyone was looking at my car, not my friends cars.
Back to your original question though. I'd easily recommend the Sport package. Base or Touring is up to you if you care about the other ammenities, but the Sport is easily worth the cash to me. I don't think the Nismo is worth it though.
As for mods, I agree with everyone else pretty much, NA, cold air intake, long tube headers or high flow cats, an exhaust, and a tune and you'd be good. for suspension, sways and either springs or coils, other mods depend on what you really want/need.
As for a tuner, Performance Motorsports, which if you look in the North East section on the forum, you'll see they are one of the top tuners in the country, there is also VinnyTen Racing.
Dealers, Koepel Nissan in Queens is/used to be a forum sponsor, you might want to search for them on the forum, or stop by there, i dont remember off the top of my head who you'd want to speak with.
Good Luck!
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2009 Touring & Sport Package || Platinum Graphite || 40% 3M Tint || Xpel Clear Bra || Berk CBE || Berk HFC || Stillen Sway Bar || H&R Spacers || Swift Springs || SPC Rear Camber Kit || Thanks to Savage Autosports, VTR, PM, and R.A.D.
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