looking to buy a G35...feedback?

Hey guys, im going to start looking for a used G35 coupe soon, but have a few questions.

Im just curious if certain years or trims are better than others or are prone to certain problems, and what I should look for and beware of while shopping.

Are there different trims? Whats the difference between trims?

I know they did a moderate facelift recently. Was the asthetics the only change, or was there mechanical changes as well?

Are then indeed mechanically identical to the 350?

lastly, what should i expect to pay for one?

thanks guys.

hey man, i am lookin at g35;s as well, 03 is first year, the only problem i have heard of, is alignment problems chew up tires, u hav to check used b4 u buy it. and trim levels, r sport package, aero package, the gps, they hav black leather or light leather, 5 speed auto or 6 speed, u know the specs, I am going with 03 g35 coupe sport 6 speed, for 18k$ . under 50 k miles, they ride nice, i was impressed.