Get the G!!!
Great year for the G35, 2008 still has the 5sp auto vs the shift happy 7 spd. It has the 2nd year for the 306 hp VQ35HR motor that doesn't cut fuel until 8000 rpm.
I put 127,000 miles on a 2007 G35 Journey and had zero real issues. The car was fantstic at the track on the street and could return decent mileage. At 77k miles your due for plugs (I did mine at 69k and 118k) which you can easily do yourself. The transmission fluid and serpentine belt need to be changed every 30k miles. The transmission service at the dealer is $160 and you get a G37 loaner to drive if you ask nice. The belt you can do your self for $35.
I tracked mine a few times a year on the twisty tracks and about once a month at the drag strip. The parts that wore out were brakes, and the front wheel bearings. Neither wheel bearing failed they just started making noise so I replaced em, they are about $180 including new bolts and you can do it yourself.
Things to watch out for, the rear suspension bushings fail. It doesn't effect much you hear a little knock on initial acceleration and then again at 1-2 shift. $160 and a Sunday fixes it forever. If they are worn you might use it to knock some $ off the asking price.
http://intensepower.com/whpotrcorecr.html
The Y pipe is the lowest part of the car I destroyed the factory Y pipe and a Topspeed Pro 1 Y pipe in 127k miles bottoming out. When I sold the car it had the Megan Racing Y pipe on it. They are cheap too about $200 new on Ebay sometimes you find em used for $100. Look under the car right about where the front door starts and there will be some mesh material coming off the exhaust manifold if its shredded you need a Y pipe. Might help knock some off the asking price.
Fantastic Car plus its rear wheel drive the other two your looking at are not. Infiniti is a luxury brand Nissan is not.
I sold my 2007 G35 for $12,000 cash on Craigslist with 127,000 miles on it to the 3rd guy that looked at it in less then 2 weeks. The G is going to hold its value better then the Maxima or Altima.
This is what a damaged Y pipe looks like
What you can enjoy doing with your G
Plugs at 69k vs a new plug they are Iridium
