If you take it to Nissan you will pay a fortune and they won't be any better than a good independent garage so for starters I'd find a good independent garage to take your Zed too. You will save hundreds.
Has your Zed had it's spark plugs changed at all do you know? This should be done I believe around the 54K miles mark or every 5 years whichever comes soonest. Also the coolant should be changed every 3 years and brake fluid every 2 years I think so probably wise to get that done as well.
Your Zed doesn't appear to have been driven regularly (as the mileage is low) so I assume a previous owner was just being extra careful by giving it a major service more regularly which is a good thing imo.
More info in the link provided below;
http://www.350z-uk.com/topic/31107-service-schedule-for-a-350z/