Yes, by all means do not purchase tires from Nissan unless you want to get ripped off. They told one of the GT-R boys his tire was $800 a pop!! But Tirerack has it for $378.
I plan on purchasing the Michelin Pilot Sport A/S Plus for my next set: they are a nice all season tire with very high tread wear. You may want to give them a gander (Tire Rack). Which ever you choose please try to get some form of road hazard protection, at this price point unexpected surprises do sting just a little bit more.