as others have said, avoid the '03-'04 G35. the interior was heavily revised in '05, with a restyled dash, gauges, and soft-touch materials. they also added MP3 playback on the CD player. the exterior upgrades greatly improved the looks of the sedan, which started to mimic the coupe (especially the front bumper and revised taillights).

i had a lot of early build quality issues on my '03 coupe: interior rattles around the clock, rear speaker deck rattle, passenger side window regulator failed, and the passenger door lock actuator failed. there was also a 1/2" gap between the rear quarter panel window and the interior trim.

mechanically, i had the same alignment issues in the front, which caused the tires to feather/cup. there was a TSB on the 350Z for the exact same problem, but it was never acknowledged on the G. the other major issue i had was with the transmission. other than being a bitch to drive smoothly because of the high engagement point, it sounded like marbles were jumping up and down in the gear box h: i dont know if you were looking at manuals, but the car is much better suited to the automatic.