Back in October I bought an 05 G35x and was a great choice. I've been through 3 generations of Infiniti's and never had any problems. Since mine was bought through an auction when it was taken in for routine maintenance there were all the service records were maintained. Not saying everyone will agree about how great a G35x is but in my opinion a fun & great car compared to alot of the higher end luxury cars.
The biggest thing that sold me on the G35x was the Intelligent Key or Smart Key however it is called. Makes it convenient that you can keep the key in your pocket and can open your doors, trunk and start your car all with the push of a button.
A previous Infiniti model that I owned had heated steering wheel & also rear heated seats and in the midwest and other parts of the US that go through cold winters it was definitely unique and set apart from other cars. I'm not sure if newer models have this but my 2002 Infiniti I35 did.