Hey JX35MD - Here are the rates I got from an online website (I think its a dealer in Florida).
Premium - 1399
Elite 1 - 939
Elite 2 - 669
I don't know all the details of the different plans, but on our contract there are selections for $0, $50, $100 deductible and we have the zero. That may be the 3 levels you are quoting. It's also not the time period, but miles that matter more when looking at a maintenance plan as most folks go based on mileage not how many months they've had their car. I don't have a printout of their standard service pricing, but she showed me all the expected services and prices on her computer screen and they were 49 or 59 for a 3750 mile oil change, about 100 for the 7500 mile oil change and and tire rotation and inspections, about 499 for a 15000 or 45000 mile intermediate service, and 699 for a 30000 mile major. All of those added up to 2246 over 45000 miles.
Those are on par with my experience when I call for quotes to service my 2007 G35S. I usually end up going with my independent repair guy who used to be a master technician at an Infiniti dealer for 10 years. He charges about 65% of dealer charge, but he doesn't have a loaner or shuttle and does not wash the car. Many real picky owners over at the G35 forums say that they always demand NO car wash, but I've never had any problems when getting it washed at the dealer with a service or warranty repair.
My local dealer now charges something like $10 or $15 for fuel every time you get a loaner. It used to be free loaner and return it with the same amount of fuel, but many probably abused that. Now they charge that upfront and you return it was whatever amount of fuel you want. I had to send them out to fuel up the car once when they tried to give me a loaner with the low fuel warning flashing on the info screen.